Mustang Bass Serial Numbers: Dating & Identification Guide
Learn how to read Mustang Bass serial numbers to date your short-scale Fender bass by year, country, and era. Covers USA, Mexico, Japan prefixes and the Fender decoder.
Mustang Bass Serial Numbers Explained
Mustang Bass serial numbers are the quickest way to turn a stamped or printed code into the birth year, factory, and era of your short-scale Fender bass. Whether you are hunting for a vintage specimen, verifying a used listing, or just curious about the instrument in your hands, the serial number is always the best place to start.
Fender launched the Mustang Bass in 1966 as a companion to the Mustang guitar, and it has been built in the USA, Mexico, Japan, Korea, Indonesia, and China over the decades. Each factory used its own numbering system, so a prefix like MX, JV, or US tells a very different story. The easiest first step is to run the number through the Fender serial number lookup tool.
Dated your Mustang Bass? Get the exact setup specs for your year and series — action, relief, pickup height, and intonation — pre-filled on a printable PDF.
Fender Setup Cheat Sheet: Exact Specs That Work
What a Mustang Bass Serial Number Tells You
A serial number is not a certificate of authenticity on its own, but it usually reveals the most important facts:
- Production year — the calendar year the bass left the factory
- Manufacturing country — USA, Mexico, Japan, Korea, Indonesia, or China
- Factory or series — Corona, Ensenada, Fuji-Gen, Dyna Gakki, and others
- Era classification — pre-CBS, CBS-era, modern, or reissue
It does not prove originality by itself. Necks and bodies get swapped, decals get reprinted, and parts-basses are common in the used market. Treat the serial as the first filter, then back it up with physical inspection. For high-value or suspicious instruments, pair the serial check with the Fender fake checker.
Where to Find the Serial Number on a Mustang Bass
Mustang Basses have carried their serial numbers in almost every location Fender has ever used. The exact spot depends on the year and country of manufacture, so check all the likely places before deciding the number is missing.
Headstock Back (Most Common Today)
Modern American, Mexican, and most Squier Mustang Basses carry the serial on the back of the headstock. Look for a black or silver print near the bottom edge. Typical examples include US22A12345, MX21012345, or IC210123456. On reissues and some Custom Shop instruments the number may be stamped into the wood.
Neck Plate (Vintage and Reissues)
Pre-1976 Fenders and many vintage reissues stamp the serial on the metal neck plate between the neck and body. You can see it without removing anything by looking at the back of the bass where the neck bolts on.
Headstock Front (1960s–1970s)
Some CBS-era Mustang Basses and 1960s reissues place the serial on the front of the headstock, usually near the Fender logo. These are often shorter numbers, sometimes five or six digits with no prefix.
Neck Heel and Body Cavity
Some Japanese and Custom Shop guitars add a secondary stamp inside the neck pocket or on the heel of the neck. You may need to loosen the neck bolts to see it. These internal numbers can confirm the headstock number or reveal a replacement neck.
Decoding American Mustang Bass Serial Numbers
USA Mustang Bass serials fall into clear eras. Because the Mustang Bass arrived in 1966, the early history is shorter than the Stratocaster or Telecaster, but the numbering system is the same.
1966–1969: Plain Numbers and L-Series Overlap
The first Mustang Basses were built during the CBS era and share the company-wide sequential numbering used on other Fender electrics. The serial was stamped on the neck plate or headstock front.
| Approximate Year | Serial Range |
|---|---|
| 1966 | 150000 – 180000 |
| 1967 | 180000 – 210000 |
| 1968 | 210000 – 250000 |
| 1969 | 250000 – 280000 |
Some very early 1966 examples may overlap with the tail end of the L-series range if parts were carried over from 1965. If a seller claims a 1966 Mustang Bass with a serial above 180000, be skeptical — genuine first-year examples usually carry lower numbers.
1970–1976: CBS-Era Plain Numbers
After the launch rush, the Mustang Bass continued with plain sequential numbering on the neck plate, often with the large Fender "F" neck plate.
| Approximate Year | Serial Range |
|---|---|
| 1970 | 280000 – 300000 |
| 1971 | 300000 – 340000 |
| 1972 | 340000 – 370000 |
| 1973 | 370000 – 520000 |
| 1974 | 500000 – 580000 |
| 1975 | 580000 – 690000 |
| 1976 | 690000 – 750000 |
CBS-era Mustang Basses are still collectible, though they often have thicker finishes and slimmer necks than the earliest examples. See the Fender CBS-era serial guide for the broader timeline.
1976–1982: S and E Prefixes
In 1976 Fender added a letter prefix that indicates the decade. For the original USA Mustang Bass run, this covers the final years before production moved overseas.
| Prefix | Decade |
|---|---|
| S | 1970s (S8 = 1978) |
| E | 1980s (E2 = 1982) |
So S9 12345 is 1979 and E2 12345 is 1982. The original USA Mustang Bass line was discontinued around 1982, so E-prefix Mustang Basses are rare. See the Fender S-Series serial guide and Fender E-Series serial guide for deeper detail.
Modern American Mustang Basses (2010–Present)
Current USA Mustang Basses typically use a format like US22A12345. The US means USA, the next two digits are the year, and the following letter is a batch or month code. American Performer, American Original '60s, and some reissue models may use V prefixes that do not directly encode the year, so check the neck date on those.
🛠️ Setting up a vintage or USA Mustang Bass? Factory specs changed by era. The Fender Setup Guide has action, relief, and pickup heights for American Performer, Vintera, and Player Mustang Basses on one printable card.
Once you know your Mustang Bass's year, set it up with the factory-correct specs for that era — all on one printable card.
Fender Setup Cheat Sheet: Exact Specs That Work
Decoding Mexican Mustang Bass Serial Numbers
Mexican Mustang Basses use an M factory prefix followed by a year code. The exact letter pair changed over time, which makes the format look more complicated than it really is.
| Prefix | Factory / Era |
|---|---|
| M + 0–9 | Early Ensenada (1990s) |
| MN | Ensenada, Mexico (1990s–2010s) |
| MZ | Ensenada, Mexico (2000s–present) |
| MX | Ensenada, Mexico (modern) |
The digits after the prefix are the year. MN10 12345 is 2010, MZ15 12345 is 2015, and MX21A12345 is 2021. See the Fender MN/MZ serial guide or the Fender MX serial guide for a deeper dive.
Player Series and Vintera
Player Series Mustang Basses made in Mexico carry MX prefixes. Vintera '60s Mustang Basses also come from Ensenada but may use different batch lettering. If you see an MX or MZ number, you are almost certainly looking at a Mexican-made Mustang Bass.
Decoding Japanese Mustang Bass Serial Numbers
Japan-made Mustang Basses and Squiers have some of the most collectable serial histories. The formats changed several times between 1982 and today.
JV and SQ Series (1982–1984)
The first Squiers were made by Fuji-Gen in Japan and carried JV or SQ prefixes. JV Squiers from 1982–1984 are especially sought after. A genuine JV serial reads JV0xxxxx for 1982, JV1xxxxx for 1983, and JV2xxxxx for 1984. See the Fender JV/SQ serial guide for full details.
E-Series and A/B/C Series (1984–1990)
Fender Japan used letter prefixes that overlap with the US system, which causes confusion. A Japanese E4 bass is a 1984 Fuji-Gen Fender Japan model, not a 1984 US Fender. Similarly, A, B, and C prefixes were used by Fuji-Gen in the mid-to-late 1980s. See the Fender E-Series serial guide for more.
Crafted in Japan (1990s–2000s)
Around 1997 the "Made in Japan" decal changed to "Crafted in Japan." Serials became nine or ten digits, with the leading digits indicating the year. These instruments are still well regarded and often out-value modern imports.
Modern Japan Mustang Basses
Current Fender Japan models use longer numeric serials stamped on the back of the headstock. The year is not always obvious from the digits alone, so the Fender serial number decoder is the reliable route for anything built after 2015.
Strings for Every Mustang Bass Era
Buy on AmazonOther Mustang Bass Origins: Korea, Indonesia, and China
Not every Mustang Bass was made in the USA, Mexico, or Japan. Fender and Squier also built short-scale basses in Korea, Indonesia, and China.
Korean Mustang Basses
Korean-made Fenders and Squiers from the late 1980s and 1990s used prefixes like E, S, and K. These are less common but still appear in the used market.
Indonesian Mustang Basses
Modern Squier Classic Vibe, Contemporary, and some Affinity Mustang Basses come from Indonesia. Look for IC, IS, or CIS prefixes. The year is encoded in the digits after the factory code.
Chinese Mustang Basses
China-made Squiers use prefixes like CY, CC, and CN. These are entry-level instruments aimed at beginners and are priced accordingly. Check the prefix before paying a vintage Japanese price.
What to Do After You Decode Your Mustang Bass
Once the serial tells you the year and country, the next steps are value, authenticity, and setup.
Check the Market Value
A serial decode gives you the baseline era. For an actual market range, plug the details into the Guitar Price Estimate. It weights year, model, condition, and current demand so you know whether a listing is fair before you make an offer.
If you are selling, use the value estimate to set a realistic price. A decoded year and origin sells faster than a vague "used Mustang Bass."
Verify Authenticity
Serial decoding is step one. Step two is checking that the bass matches the serial. Red flags include:
- A 1960s-style logo on a bass with a 1990s serial
- Modern tuners on a vintage-era serial
- A neck-plate serial that conflicts with the headstock serial
- Missing or reprinted decals
For a red-flag checklist, use the free Fender fake checker.
Set It Up for the Correct Era
A 1972 Mustang Bass needs different setup expectations than a 2024 Player model. Neck profiles, fretboard radius, bridge type, and pickup output all affect the ideal action and pickup height. The Fender Setup Guide and Bass Setup Guide cover the measurements step by step.
A good starting point for a modern Mustang Bass is:
- Neck relief: roughly 0.010 inches at the 7th fret with the string held at the 1st and last frets
- Action at the 12th fret: about 1.6 mm (1/16 inch) on the high G and 2.0 mm (5/64 inch) on the low E
- Pickup height: around 2.4 mm (3/32 inch) on the bass side and 2.0 mm (5/64 inch) on the treble side, measured from the pole piece to the bottom of the string with the string held at the last fret
Common Mustang Bass Serial Number Mistakes
Buyers and sellers make the same errors repeatedly. Avoiding these saves money and embarrassment.
Confusing US and Japanese E-Series Prefixes
A US E4 serial means a 1984 American guitar. A Japanese E4 serial means a 1984 Fuji-Gen Japan guitar. The same prefix in two different factories represents two very different values. Always check the "Made in..." text on the headstock or the decoder's country field.
Assuming Lower Serial Numbers Are Always Better
A low serial does not automatically make a bass more valuable. A 1979 Mustang Bass with serial S9 000123 is still a 1979 Mustang Bass. The year, condition, and originality matter far more than the specific number within that year.
Trusting the Decal Over the Serial
Decals are easy to reprint. A headstock can say "Vintage Reissue" while the serial points to a 2010 Mexican Standard. If the serial and the decal disagree, believe the serial and investigate further.
Treating Squier Serials Like Fender Serials
Squier has its own numbering system. Modern Squiers use IC, CY, CC, CIS, and similar prefixes that never appear on USA Fenders. Use the Squier serial number lookup for any bass with a Squier decal.
Keep Your Mustang Bass Playing Its Best
Frequently Asked Questions
How do I read a Mustang Bass serial number?
Locate the serial on the back of the headstock, neck plate, or headstock front. Note the full prefix and digits, then enter them into the Fender serial number decoder. The prefix letters tell you the factory and decade, while the digits usually reveal the year.
Where is the serial number on a Mustang Bass?
Most Mustang Basses have the serial on the back of the headstock. Vintage models may use the neck plate or the front of the headstock. Some Japanese and Custom Shop instruments also stamp a secondary number inside the neck pocket or on the neck heel.
What does a US Mustang Bass serial number look like?
Modern USA serials start with US followed by two year digits and a batch code, such as US22A12345. Vintage USA serials are plain five- to six-digit numbers. The late-1970s to early-1980s original run used S and E prefixes, while reissue models may carry N, Z, or V prefixes.
What does an MX serial number mean on a Mustang Bass?
MX means the bass was made in Ensenada, Mexico. The digits after MX indicate the year. For example, MX21A12345 is a 2021 Mexican Mustang Bass.
Are Japanese Mustang Bass serial numbers different?
Yes. Japanese Mustang Basses and Squiers use their own prefixes, including JV, SQ, E, A, B, and C in the 1980s, and longer numeric serials in the "Crafted in Japan" era. Modern Japan models use nine- or ten-digit numbers best read with the decoder.
Can a Mustang Bass serial number be fake?
Yes. Decals and stamps can be reproduced. A fake serial may decode to a year or factory that does not match the bass's hardware, logo, or wear. Always cross-check the serial against the physical features and use an authenticity checklist for expensive instruments.
How do I know if my Mustang Bass is American or Mexican?
The prefix is the quickest clue. American guitars typically use US, V, or plain vintage numbers. Mexican guitars use M, MN, MZ, or MX.
What year is my Mustang Bass by serial number?
Enter the serial into the Fender serial number lookup. For most instruments it returns the exact production year. For ambiguous or transitional serials, the decoder will flag the likely range.
Does the serial number affect Mustang Bass value?
Indirectly. The serial identifies the year and factory, which are two major value drivers. Condition, originality, and market demand then refine the price. Use the Guitar Price Estimate for a current market range.
Why does my Mustang Bass have two serial numbers?
Some instruments carry a headstock serial and a separate neck-plate or neck-heel stamp. This is normal for vintage, Japanese, and Custom Shop instruments. If the two numbers conflict, the bass may have had a replacement neck or body.
Internal Links and Next Steps
Now that you can decode your Mustang Bass, here are the best next steps:
- Run the serial through the Fender serial number lookup if you have not already.
- Verify the instrument with the free Fender authenticity checker.
- Get a market range with the Guitar Price Estimate.
- Set up your bass with the Fender Setup Guide or the dedicated Bass Setup Guide.
- Compare other short-scale Fender basses in the Precision Bass serial number guide or the Jazz Bass setup guide.
- Explore the pre-CBS era in the Fender pre-CBS serial guide.
Bottom Line: Decode Your Mustang Bass, Then Decide
Mustang Bass serial numbers turn a mysterious string of letters and digits into a clear year, factory, and era. Start with the Fender serial number decoder, confirm the physical details, check the market value with the Guitar Price Estimate, and set the bass up with the specs that match its era.
If you are buying used, never skip the serial check. If you are selling, lead your listing with the decoded year and origin. And if you just want to know your bass better, the serial is the quickest history lesson you can get.
Return to the Mustang hub for more guides, specs, and buying advice.
