Gibson Serial Number Lookup: Decode the Year, Day & Factory

Quick answer: Your Gibson serial number is usually stamped on the back of the headstock; on acoustics it may be on a soundhole label or neck block. For 8- and 9-digit serials (1977 to present), the 1st and 5th digits give the year and a ranking of 500+ means Nashville. Enter it in the free checker above for an instant year and factory, or match it against the format tables below.

On this page:

• Gibson Serial Number Lookup
• Where Is My Gibson Serial Number?
• Serial Number Formats (1977–Present)
• Special Formats (Custom Shop, Les Paul Classic)
• Serial Prefix Quick Reference
• Worked Examples
• Factory Locations
• Authentication Tips
• Common Reading Mistakes
• What's Your Gibson Worth?
• Troubleshooting Guide
• FAQ
• Other Brand Decoders

How to Read a Gibson Serial Number

Since 1977, most Gibson serial numbers carry the year in the 1st and 5th digits and the day of the year in digits 2–4. Enter yours in the decoder above for the year, build day and factory, or match it against the format sections below. Each format includes worked examples, and every example on this page decodes to the same answer in the tool.

The decoder covers Gibson electrics and acoustics from 1975 to the present, including Nashville, Kalamazoo, Bozeman and Custom Shop serials. Pre-1975 serials and Factory Order Numbers need manual identification.

Own another guitar? We also have free serial number decoders for Fender, Squier, ESP, LTD, Schecter, Charvel, Epiphone, Gretsch, Ibanez, Jackson, Martin, PRS, Taylor, Takamine, Yamaha, Chapman, Eastman, Guild, Harley Benton, Rickenbacker, Cort, and Seagull.

Part 1: Where Is My Gibson Serial Number?

Before you can lookup your Gibson, you need to find the number. Gibson has used several locations over the decades.

• Back of Headstock: The most common location for Gibson electrics and many acoustics. Look for stamped or engraved numbers on the back of the headstock, often near the tuning machines.
• Inside the Body: On acoustic guitars, the serial number may be stamped on a label inside the soundhole or on the neck block visible through the soundhole.
• Neck Block: On some Gibson acoustics, the serial appears on the neck block (the wooden block where the neck joins the body). You may need a mirror and flashlight to read it.
• Label: Vintage Gibson acoustics sometimes have paper labels with serial information. Handle these carefully—labels can deteriorate over time.

Pro tip: Serial numbers can be faint, especially on older guitars. Use good lighting and a magnifying glass if needed. Avoid cleaning or rubbing the area—you could damage the stamping.

Photo by Tyler Clemmensen on Unsplash

Part 2: Standard 8-Digit Format (1977-2005) — YDDDYRRR

From 1977 through 2005, Gibson used an 8-digit format that encodes year, day of year, and factory ranking. Understanding this format unlocks most guitars from this era.

The Format Explained

Factory determination: The ranking number (positions 6-8) tells you where the guitar was built. 001-499 = Kalamazoo (pre-1984 only—Kalamazoo closed in 1984). 500-999 = Nashville. After 1984, all electrics came from Nashville; rankings below 500 on post-1984 guitars may indicate Bozeman acoustics.

Worked Examples

• 82765501: Year = 85 (1985), Day = 276, Ranking = 501 → 1985, Nashville (day 276 = early October)
• 90120512: Year = 90 (1990), Day = 12, Ranking = 512 → 1990, Nashville (day 12 = mid-January)
• 02342501: Year = 02 (2002), Day = 234, Ranking = 501 → 2002, Nashville (day 234 = late August)

Year Range Reference

Part 3: 9-Digit Format (2005-2014) — YDDDYBRRR

In 2005, Gibson added a batch digit, expanding the format to 9 digits. The structure is the same as the 8-digit format, with one extra digit.

The Format

The batch digit (B) indicates which production run the guitar came from on that day. Gibson increased production volume, so multiple batches per day became common.

Worked Examples

• 109230345: Year = 13 (2013), Day = 92, Batch = 0, Ranking = 345 → 2013, Nashville (day 92 = early April)
• 015091234: Year = 09 (2009), Day = 150, Batch = 1, Ranking = 234 → 2009, Nashville (day 150 = late May)

Part 4: 9-Digit No-Day Format (2014-2019) — YYRRRRRRR

From 2014 through mid-2019, Gibson simplified the format. The day-of-year was dropped in favor of a straightforward production number.

The Format

Important: The model year can start in the previous calendar year. A guitar with serial starting "19" could have been built in late 2018 or anytime in 2019. Gibson's model year often runs from summer to summer.

Worked Examples

• 150012345: Year = 15 (2015), Production = 012345 → 2015, Nashville
• 181234567: Year = 18 (2018), Production = 1234567 → 2018, Nashville

Part 5: Current Format (2019-Present) — YDDDYBRRR

In mid-2019, Gibson returned to the day-of-year format, matching the 2005-2014 structure. If you have a 9-digit serial with a valid day-of-year (positions 2-4 between 001 and 366), it's likely 2019 or later.

Worked Examples

• 215011234: Year = 21 (2021), Day = 150, Batch = 1, Ranking = 234 → 2021, Nashville (day 150 = late May)
• 201243456: Year = 24 (2024), Day = 12, Batch = 3, Ranking = 456 → 2024, Nashville (day 12 = mid-January)

Part 6: Special Formats

Gibson has used several non-standard formats for specific models and eras. These require careful identification.

Custom Shop (CS Prefix)

Custom Shop guitars use CS followed by a year digit and production number. Format: CS + Y + RRRRR (e.g., CS512345 = 2015 Custom Shop). These are handcrafted in Nashville and command premium prices.

1994 Centennial (94 Prefix)

Gibson's 100th anniversary models use serials starting with 94 followed by 6 digits (e.g., 94123456). These are 1994 Nashville-built instruments.

Les Paul Classic 1989-1999 (Y + space + RRRR)

Les Paul Classic models from 1989-1999 used a short format: single digit (year) + space + 4 digits. Example: 9 1234 = 1999. The year digit: 0 = 2000, 1 = 1991, 9 = 1999.

Les Paul Classic 2000-2014 (YYRRRR, 6 digits)

From 2000-2014, Les Paul Classic used a 6-digit format: YY + RRRR. Example: 091234 = 2009. The first two digits are the year.

1975-1977 Decal Era

Before the standard 8-digit format, Gibson used decal serials with special two-digit codes:

Note: "06" can overlap with 2006 in the YDDDYRRR format. Check the guitar's physical features—1977 decal-era guitars have distinct period characteristics.

Pre-1975 Vintage (FON Numbers, Ink Stamps)

Pre-1975 Gibson guitars used Factory Order Numbers (FON), ink stamps, and other systems that varied by model and year. These require manual identification using reference books, forums, or expert appraisal. For 6-digit 1960s serials the decoder can only suggest the decade, because Gibson reused those numbers; other pre-1975 systems are not decoded. The resources below can point you in the right direction.

For additional manual reference tables, see Vincent Contreras's Gibson section of The Serial Bowl, which covers early Factory Order Numbers and overlapping vintage serial ranges. Cross-check any suggested date against the guitar's features and available manufacturer records.

Worked Examples: Decoder Output for Each Format

These rows are generated from the same decoder that runs at the top of this page. The serials are made-up numbers that follow each Gibson format, so you can see how your own number should read before you enter it.

Gibson Factory Locations

Understanding where your Gibson was built adds context to its value and character.

Kalamazoo, Michigan (Until 1984)

Gibson's original home. The Kalamazoo factory produced legendary instruments from the 1950s through 1984. In the 8-digit format, ranking 001-499 indicates Kalamazoo. The factory closed in 1984; Nashville took over electric production.

Nashville, Tennessee (1977-Present, Electrics)

Gibson's main electric guitar factory since 1977. Ranking 500-999 in the 8-digit format, and virtually all 9-digit electrics, come from Nashville. Custom Shop instruments are also built here.

Bozeman, Montana (1989-Present, Acoustics)

Gibson's acoustic division. J-45, Hummingbird, and other acoustic models are built in Bozeman. In the 8-digit format, post-1989 guitars with ranking 001-499 may be Bozeman acoustics.

Memphis, Tennessee (Closed)

Gibson's Memphis factory produced semi-hollow and hollow-body electrics (ES-335, ES-175, etc.) from 1999 until its closure. Memphis-built guitars may have Nashville-style serials with factory designation in documentation.

How to Read Your Gibson Serial: Step-by-Step

Follow this process to decode any Gibson from 1975 onward.

1. Locate the serial number on the back of the headstock, inside the body, or on the neck block.
2. Count the digits. 8 digits = 1977-2005 format. 9 digits = 2005-2014, 2014-2019, or 2019+.
3. Check for prefixes. CS = Custom Shop. 94 = 1994 Centennial.
4. For 8-digit (YDDDYRRR): Positions 1 and 5 = year. Positions 2-4 = day of year. Positions 6-8 = factory (500+ = Nashville).
5. For 9-digit with day (YDDDYBRRR): Same as 8-digit, with batch at position 6. Positions 1 and 5 = year.
6. For 9-digit no-day (YYRRRRRRR): First 2 digits = year. Remaining 7 = production number.

Day-of-year conversion tip: Day 001 = January 1. Day 365/366 = December 31. Use an online "day of year" calculator to convert DDD to a calendar date if needed.

Serial Prefix Quick Reference

Authentication Tips: Spotting Fake Gibsons

Serial numbers are your first line of defense against counterfeits. Here's how to use them.

Red flags:

• Format doesn't match the era. A guitar that looks like a 1990s Les Paul but has a 2014-2019 format serial is suspicious.
• Font and depth. Gibson stamps are consistent. Sloppy, shallow, or printed-looking serials suggest a fake.
• Wrong location. Serials should be on the back of the headstock for most models. Multiple serials or serials in odd places are concerning.
• Physical features don't match. A serial suggesting 1985 Kalamazoo but with modern hardware, logo, or body routes indicates a problem.

Verification steps:

1. Run the serial through our decoder. Does the result match the guitar's apparent age and features?
2. Check the factory. Pre-1984 Kalamazoo vs Nashville matters. Post-1984, electrics should be Nashville.
3. Compare logo style, tuners, and hardware to known examples from that year.
4. For high-value guitars, consider professional authentication.

Want the structured version? Run the free Gibson fake checker (Chibson tells) — a two-minute red-flag checklist tuned to Gibson's details (headstock angle, scarf joints, inlays, serials) that returns an instant risk band.

Still unsure it's the real thing? The free fake Gibson quick-check runs the classic counterfeit tells — price, seller behaviour, serial number, decals, workmanship — plus Gibson-specific tells like headstock angle, inlays, scarf joints, and returns an instant risk band in two minutes. It can't see the guitar, but it tells you how hard to look before you pay.

Common Gibson Serial Reading Mistakes

• Reading the first two digits as the year. In the 8- and 9-digit day-of-year formats the year is digits 1 and 5. 82765501 is day 276 of 1985 (early October), not a 1982 guitar.
• Assuming every 1980s Gibson is from Nashville. Before Kalamazoo closed in 1984, rankings 001–499 point to Kalamazoo. 80120234 decodes to 1980, Kalamazoo.
• Reading a 2014–2019 serial as the calendar year. These serials give the model year, which can start the previous summer. 181234567 is a 2018 model year that may have been built in late 2017.
• Writing off a short serial as fake. Les Paul Classics used their own short formats. 091234 is a 2000–2014 Les Paul Classic serial for 2009.
• Assuming no headstock serial means a fake acoustic. Check the soundhole label and the neck block with a mirror and torch before drawing conclusions. Post-1989 acoustics come from Bozeman, not Nashville.

What a Gibson Serial Number Can't Tell You

• Whether the guitar is genuine. Counterfeiters copy valid serials. A serial that decodes cleanly only shows the number fits Gibson's format; the hardware, routing, headstock and logo still need to match that year.
• The model. The serial dates the instrument; the model comes from the truss rod cover, headstock, body and paperwork.
• Its value. The year and factory narrow the era. Model, originality and condition decide the price.
• Exact dates for most vintage guitars. 1960s 6-digit serials were reused, so they only point to a decade.

Tools for Evaluating a Gibson

Whether you're buying, selling, or just checking your guitar's condition, these tools help verify setup and authenticity:

Recommended Strings for Your Gibson

Now that you've identified your Gibson's production year, it's time to choose strings that match its era and construction. Gibson's 24.75" scale length responds differently to string gauge than Fender's 25.5" scale:

For Les Paul and SG models (humbuckers): 10-46 is the most popular choice. The shorter scale naturally produces a warmer, fatter tone, so lighter gauges still sound full.

For vintage-style tone (PAF-style pickups): Pure nickel strings deliver that warm, vintage Les Paul sound. Try 10-46 for authentic feel.

For heavier styles (rock/metal): 11-48 provides tighter low end and better tuning stability for drop tunings on Les Paul and SG.

For ES-335 and semi-hollow models: 11-48 offers better definition and prevents the hollow body from sounding muddy.

For acoustic models (J-45, Hummingbird): 12-53 light phosphor bronze is standard; 11-52 custom light is easier to play.

Learn more about choosing a gauge in the String Gauge Guide or use the String Gauge Recommendation Tool.

Essential Maintenance for Your Gibson

Gibson guitars require specific care to maintain their value and playability. After identifying your guitar, consider these maintenance essentials:

String care: Clean strings after every playing session. Gibson's shorter scale can cause strings to feel "floppy"—fresh, clean strings maintain tension feel and tone.

Humidity control: Les Pauls and SGs with mahogany bodies are sensitive to humidity changes. Cracks at the headstock and neck joint are common in dry conditions. Use a case humidifier.

Tune-o-Matic bridge maintenance: Keep the bridge saddles and posts lubricated for smooth action adjustments. Intonation screws can seize if not maintained.

Stopbar tailpiece: Check that the stopbar is set at the correct height. Too high and you lose sustain; too low and strings may break at the bridge.

Value by Serial Number: What's Your Gibson Worth?

Serial number dating is the first step to valuing your Gibson. Once you know the year and factory, you can estimate market value. These ranges are approximate and vary by condition, originality, and market conditions.

Kalamazoo Era (Pre-1984)

Kalamazoo-built guitars command a premium over Nashville equivalents from the same period. Collectors prize the original factory's output.

• Les Paul Standard: $3,000–$15,000+ depending on year and condition. Late 1970s Norlin-era Standards run $3,000–$5,000; early 1980s examples can reach $6,000–$10,000.
• Les Paul Custom: $4,000–$20,000+. Customs from the late 1970s and early 1980s are highly sought.
• SG Standard: $2,000–$8,000+. Kalamazoo SGs from 1980-1983 are particularly collectible.
• ES-335: $3,000–$12,000+. Semi-hollows from Kalamazoo hold value well.

Nashville Era (1985-1999)

Quality improved significantly through the 1990s. Nashville production from this era is generally more consistent than late Norlin.

• Les Paul Standard: $1,500–$4,000. Late 1990s Standards with improved quality can reach the upper end.
• Les Paul Custom: $2,000–$5,000.
• SG Standard: $1,000–$3,000.

Modern Era (2000-2014)

Gibson's quality was inconsistent during this period. Weight relief, chambering, and other changes divided opinion. Prices reflect that variability.

• Les Paul Standard: $1,200–$3,500. Traditional and Classic models often $1,000–$2,500.
• Les Paul Traditional: $1,000–$2,500. Favored by players seeking a more vintage feel.

Current Era (2019-Present)

Under new ownership since 2018, Gibson's quality control improved. New guitars hold value better than 2000s-era instruments.

• Les Paul Standard (retail): $2,000–$3,500. Used examples typically hold 60–80% of retail.
• Quality control improved significantly. Expect stronger resale than 2005-2014 equivalents.

Custom Shop

Custom Shop instruments are handcrafted in Nashville and command premium prices.

• Range: $3,500–$15,000+ depending on model and master builder.
• Historic Reissues: $4,000–$8,000+ for R8, R9, R0 designations.
• Custom orders: Can exceed $15,000. Holds value well when documentation is intact.

Factors That Affect Value Beyond Serial Number

Condition is the most important factor. Mint condition commands 20–40% more than "good" condition. Refinishes, repairs, and modifications reduce value.

Originality matters. Original pickups, hardware, and finish add value. Replaced tuners, swapped pickups, or refinishing can cut value by 15–30%.

Weight affects Les Paul prices. Lighter bodies (under 9 lbs) often command a premium. Heavy Norlin-era Les Pauls (10+ lbs) sell for less than lighter examples from the same year.

Documentation helps. Original case, hang tags, and warranty cards add 5–15% for collectible models.

Case and accessories matter. Original Gibson hard case adds $100–$300 to resale. Aftermarket cases don't add value.

Decade-by-Decade: What Your Gibson Serial Number Reveals

Your serial number places your guitar in history. Each decade brought different models, specs, and quality levels.

1970s (Norlin Era): Gibson was owned by Norlin Industries from 1969-1986. Quality varied. Some excellent guitars were made, but the era's reputation suffered from heavier bodies and inconsistent QC. Serials use the 8-digit YDDDYRRR format from 1977 onward.

1980s: Kalamazoo closed in 1984. Nashville took over all electric production. The ranking number (001-499 vs 500-999) identifies pre-1984 factory. Nashville production ramped up significantly.

1990s: Quality improved. Gibson launched the Historic Reissue program. Les Paul Classics used the unique Y + space + RRRR format. A strong decade for used values.

2000s: Weight relief and chambering divided players. Robot tuners (2007+) were controversial. The 9-digit YDDDYBRRR format began in 2005.

2010s: Gibson faced financial challenges. The 2014-2019 YYRRRRRRR format dropped day-of-year. Bankruptcy in 2018 led to ownership change.

2020s: New ownership focused on quality. The day-of-year format returned in 2019. Current production is widely praised for consistency.

Nashville vs Kalamazoo vs Bozeman: Factory Comparison

Gibson has operated multiple factories. Knowing where your guitar was built adds context to its character and value.

Kalamazoo was Gibson's original home. The factory produced iconic instruments from the 1950s through 1984. Ranking 001-499 in the 8-digit format indicates Kalamazoo for pre-1984 guitars. Closure in 1984 ended an era.

Nashville became the main electric factory in 1977 and took over entirely after Kalamazoo closed. Ranking 500-999 in the 8-digit format, and virtually all 9-digit electrics, come from Nashville. Custom Shop instruments are built here.

Bozeman handles Gibson acoustics since 1989. J-45, Hummingbird, and other acoustic models are built in Montana. Post-1989 acoustics with ranking 001-499 in the 8-digit format are typically Bozeman.

Next Steps for Your Gibson

• Gibson Hub — Explore all Gibson guides, Les Paul & SG resources
• Gibson Setup Guide — Les Paul and SG setup specs (pickup heights, truss rod, bridge)
• Les Paul Setup Guide — Complete walkthrough for action, pickups, intonation
• Setup Specs Lookup — Find factory specs by year and model
• My Gear Garage — Track your collection and maintenance schedule
• Garage Pro — Maintenance log with unlimited guitars, full history & smart reminders

Troubleshooting Guide

Can't decode your Gibson? Follow these steps.

Step 1: Check All Common Locations

Before assuming the serial is missing, check every location. Electrics: back of headstock. Acoustics: back of headstock, label inside soundhole, neck block visible through soundhole. Use a mirror and flashlight for acoustics. Some models have serials on the neck block that are partially obscured by bracing.

Step 2: Serial Is Unreadable

Faint or worn stamps are common on older guitars. Improve lighting—angled light can reveal shadows in the stamp. Use a magnifying glass or phone camera zoom. A pencil rubbing (place paper over the serial, rub with pencil) can reveal faint impressions. For photos, try increasing contrast or using a photo editor to enhance legibility. Avoid cleaning or rubbing the stamp—you could damage it.

Step 3: Serial Doesn't Match Any Format

Your serial may use a special format. Custom Shop (CS prefix), Les Paul Classic (Y + space + RRRR or YYRRRR), 1994 Centennial (94 prefix), or 1975-1977 decal era (99, 00, 06) all use non-standard formats. Pre-1975 guitars use FON numbers and ink stamps—our decoder doesn't cover these. Prototypes and one-offs may have unique serials. Check the special formats section above.

Step 4: Ambiguous Format

The 8-digit format can be ambiguous. "00" in positions 1 and 5 could mean 2000 or (in decal era) 1976. "06" could mean 2006 or 1977 decal. Compare physical features: hardware, logo, pickups. A 1977 guitar will have different tuners and cosmetics than a 2006. When in doubt, physical inspection resolves the ambiguity.

Step 5: Still Can't Identify

If you've exhausted the above, contact Gibson directly. Gibson offers limited serial lookup at gibson.com. Post on forums such as the Les Paul Forum or MyLesPaul with clear photos—experienced members can help. For high-value or pre-1975 guitars, consider a professional appraisal from a reputable dealer or authentication service.

Frequently Asked Questions

How do I read my Gibson serial number?

The serial is stamped on the back of the headstock on most electrics; acoustics may have it on a soundhole label or neck block. For 8- and 9-digit serials (1977-present), the 1st and 5th digits give the year, and the three digits in between are the day of the year—Custom Shop serials start with CS followed by a year digit. Or enter it in the free tool at the top of this page for an instant answer.

Can I look up my Gibson guitar by serial number?

Yes—the free tool at the top of this page instantly returns production year, factory, and era. No sign-up required.

How do I use the Gibson serial number lookup?

Use the free tool at the top of this page. Enter your serial number exactly as it appears on your guitar (including any spaces for Les Paul Classic format). Click Lookup to get production year, factory, and era. No sign-up required.

What is a Gibson serial number decoder?

A Gibson serial number decoder is a tool that interprets the digits in your serial number to determine production year, factory location, and sometimes the day of year. Our decoder covers 1975-present standard formats, Custom Shop, and Les Paul Classic exceptions.

How do I date a Gibson guitar?

For 1975 and later, use our lookup tool or the reference tables above. For pre-1975 guitars, you'll need to consult FON (Factory Order Number) references, ink stamp guides, or expert resources—these formats require manual identification.

Where is the Gibson Les Paul serial number?

On most Les Pauls, the serial number is stamped on the back of the headstock. Les Paul Classic models (1989-2014) use unique formats: Y + space + RRRR (1989-1999) or YYRRRR (2000-2014).

Where is the Gibson acoustic serial number?

Gibson acoustics may have the serial on the back of the headstock, on a label inside the soundhole, or stamped on the neck block visible through the soundhole. Use a mirror and flashlight if needed.

How do I read a Gibson Custom Shop serial number?

Custom Shop serials start with CS followed by a year digit (0-9 for 2000-2009) and a production number. Example: CS512345 = 2015 Custom Shop. These are built in Nashville.

What's the difference between Gibson Nashville and Kalamazoo?

Kalamazoo was Gibson's original factory (until 1984). Nashville took over electric production in 1977 and became the main factory after Kalamazoo closed. In the 8-digit format, ranking 001-499 = Kalamazoo (pre-1984), 500-999 = Nashville. Post-1984, all electrics are Nashville.

Is there a free Gibson serial number checker?

Yes. The tool at the top of this page is a free Gibson serial number checker. Enter your serial for instant results—production year, factory, and era. No sign-up or payment required. It covers 1975 to present.

What year is my Gibson?

Use our lookup tool above, or match your serial format to the tables in this guide. For 8-digit serials (1977-2005), positions 1 and 5 give the year. For 9-digit with day (2005-2014, 2019+), same rule. For 9-digit no-day (2014-2019), the first two digits are the year.

My Gibson serial number starts with 1. What does that mean?

It depends on the format. In 8-digit YDDDYRRR, a "1" in position 1 could mean 1981 (with 1 in position 5) or 1991. In 9-digit YYRRRRRRR, "1" as the first digit with "0" as second = 2010. Use our decoder for precise results.

How much is my Gibson worth?

Value depends on model, year, condition, and originality. Kalamazoo-era guitars (pre-1984) command a premium over Nashville equivalents. Les Paul Standards from Kalamazoo typically run $3,000–$15,000+; Nashville-era Standards from 1985-1999 run $1,500–$4,000. See the value guide above for era-specific ranges. Condition is the most important factor—mint commands 20–40% more than "good." For a complete breakdown of what drives guitar prices across all brands, see our complete guide to guitar valuation.

What is the Norlin era and why does it matter?

The Norlin era (1969-1986) was when Gibson was owned by Norlin Industries. Quality varied during this period. Some excellent guitars were made, but the era's reputation suffered from heavier bodies and inconsistent quality control. Serials from this era use the 8-digit YDDDYRRR format (from 1977 onward). Norlin-era guitars can be great players but often sell for less than pre-Norlin or post-Norlin equivalents.

Can I date a Gibson by the potentiometer codes?

Yes. Potentiometer codes can help verify serial number dating. The format typically includes: first 3 digits = manufacturer (137 = CTS), next 1-2 digits = year, last 2 digits = week of production. Remove the control cavity cover to inspect the pot codes. If the pot date matches the serial year, you have additional confirmation. Mismatches may indicate a pickup or electronics swap.

What does the ranking number mean in a Gibson serial?

The ranking number is positions 6-8 in the YDDDYRRR format (or 7-9 in the 9-digit format). It indicates factory and production order. 001-499 = Kalamazoo (pre-1984 only—Kalamazoo closed in 1984). 500-999 = Nashville. After 1984, all electrics are Nashville regardless of ranking. The ranking also indicates production sequence within that factory for that day.

Is my Gibson a Kalamazoo or Nashville?

Check the ranking number—the last 3 digits of an 8-digit serial (positions 6-8). Under 500 and pre-1984 = Kalamazoo. 500 or higher, or any post-1984 electric = Nashville. Our decoder shows this automatically. For 9-digit serials (2005+), virtually all electrics are Nashville. Bozeman acoustics use ranking 001-499 on post-1989 instruments.

How do I find the day of year from my Gibson serial?

Positions 2-4 in the YDDDYRRR format give the day of year (001-366). Day 001 = January 1, Day 032 = February 1, Day 060 = March 1, Day 365 = December 31. Use an online day-of-year calculator to convert DDD to an exact calendar date. The 2014-2019 YYRRRRRRR format does not include day-of-year; the 2019+ format restored it.

Does Gibson have an official serial number lookup?

Gibson offers a basic lookup at gibson.com, but it's limited in scope. Our decoder provides more detail including factory identification (Kalamazoo vs Nashville), day of year conversion, and era classification—all for free. We cover Custom Shop, Les Paul Classic, and 1975-1977 decal formats that some official resources don't fully explain.

Cross-Links: More Serial Number Resources

Decoders for other brands:

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• Squier Serial Number Lookup — Identify Squier production year and factory
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