Bulova Date Code Decoder
Unlike Rolex or Omega, Bulova stamps the production year right onto the watch — a single letter for the decade and a digit for the year. Type your code below and read the year instantly, then learn where it is stamped and how the older symbol system works.
Updated · 5 annotated diagrams · working decoder · ~8-minute read
The short answer
On any Bulova made from 1950 onward, the date code is a letter + digit stamped on the caseback and usually the movement. The letter is the decade — L = 1950s, M = 1960s, N = 1970s, P = 1980s, T = 1990s, A = 2000s, B = 2010s, C = 2020s — and the digit is the last number of the year. So M4 = 1964 and L7 = 1957. Watches from about 1924–1949 instead carry a stamped symbol on the movement. A date code tells you the age of the case and movement — it never proves the watch is authentic on its own.
Bulova Date Code Decoder
Enter the two-character date code from your caseback or movement (for example M4, L7 or B2). The decoder reads the letter as the decade and the digit as the year.
Only 1950-onward letter codes can be decoded automatically. If your watch predates 1950 it uses a stamped symbol instead, which has to be matched by eye.
Where the code is stamped
Bulova puts the date code in two places, and the same watch often carries it in both: on the caseback (stamped on the outside back, or on the inside of a snap-off back) and on the movement (near the balance or on a bridge). On pre-1950 watches only the movement is marked, so you may have to open the case to find the symbol.
How the two-character code works
Every 1950-onward code follows the same grammar: one letter, then one digit. The letter never means a year on its own — it is a decade shorthand. The digit is simply the last number of the year within that decade. Read them together and you get an exact year.
The decade-letter chart
Bulova did not run straight through the alphabet. It assigned one letter per decade and deliberately skipped O, Q, R and S (letters that read too easily as numbers or as each other). After the 2000s the sequence continued into B for the 2010s and C for the 2020s — it was not reset back to L. Here is the full run.
The one ambiguous letter: A
A0–A9 normally means the 2000s, so A5 = 2005. But a handful of late-1940s Bulovas — some ladies' models, and pieces marked A8 / A9 found dated 1948 / 1949 — also used an A code before the L system fully took over. If your watch is clearly vintage in style, an A code may point to the late 1940s rather than the 2000s. Confirm with the case, dial and movement.
Before 1950: the symbol date codes
From roughly 1924 to 1949, Bulova did not use letters. Instead it stamped a small pictorial symbol on the movement to mark the year of assembly — a star, a crescent, a shield, a triangle and so on. There are two catches. First, the symbol is on the movement, not the case, so you have to open the watch. Second, some symbols repeat across decades: the mark used for 1925 can be identical to 1934, and 1926 to 1935. Because of that, the decade has to be pinned down from the case shape, dial and hand style, then the symbol confirms the exact year within it.
Our decoder above only handles the 1950-onward letter codes. For a symbol-marked movement, photograph the mark under magnification and compare it against the myBulova.com symbol chart, using the styling to settle which decade you are in.
What the code dates — and what it doesn't
A date code answers one question well: when was this case or movement made? It does not confirm the watch is a genuine, unaltered Bulova, and it does not guarantee the case, dial and movement all left the factory together. Vintage watches get serviced, re-cased and “married” from parts, so a code is a strong dating clue — not a certificate.
Not sure your Bulova is genuine?
A date code tells you the age but never the authenticity. Upload photos of your Bulova — dial, caseback and movement — and our AI checks the details against known references and returns a detailed verdict in under 60 seconds.
Authenticate my BulovaStep by step: find and decode your code
1. Look at the caseback first
On a 1950-or-later Bulova, scan the outside of the caseback for a small stamped letter-and-digit pair. If the back is a snap-off type and the outside is blank or worn, the code is often on the inside of the back — you will need a case knife and a careful hand, or a watchmaker, to open it.
2. Check the movement
The same code is usually stamped on the movement near the balance or on a bridge. This is where a pre-1950 symbol lives, and it is a useful cross-check on later watches: if the caseback and movement codes disagree, the watch has probably been re-cased or the movement swapped.
3. Decode it
Split the code into the letter and the digit, look up the decade from the chart above (or paste it into the decoder), and read the year. M4 → 1964. If the letter is A, weigh the 2000s reading against a possible late-1940s one using the styling.
4. Sanity-check against the design
Does the decoded era fit the watch? A rectangular Art Deco case with a 1930s look should not carry an N (1970s) code. When the code and the styling disagree, dig deeper — you may be looking at a married watch, a replaced part, or a re-stamp.
5. For exact identification, use the model reference
Bulova also stamped a case model number. To go from “a 1964 Bulova” to the exact model, match the reference and the movement caliber against a catalogue — the myBulova.com and Watchophilia databases are the strongest public references for both vintage codes and models.
A note on accuracy
The 1950–2000s letter chart is well documented and widely agreed among Bulova collectors. Modern Citizen-era codes (B and C) apply the same logic but are stamped less consistently on quartz pieces. A date code establishes age, not authenticity — for a valuable or disputed Bulova, an in-person inspection by a certified watchmaker remains the gold standard.
Frequently asked questions
How do I read a Bulova date code?
On Bulova watches made from 1950 onward, the date code is a single letter followed by a single digit, such as M4. The letter identifies the decade (L = 1950s, M = 1960s, N = 1970s, P = 1980s, T = 1990s, A = 2000s, B = 2010s, C = 2020s) and the digit is the last number of the year. So M4 = 1964 and B7 = 2017. The code is usually on the caseback and often the movement too.
Where is the date code on a Bulova watch?
From 1950 onward the two-character code is normally engraved on the caseback — either the outside back or the inside of a snap-off back — and frequently repeated on the movement. On pre-1950 Bulovas the symbol date code is on the movement only, so you have to open the watch to read it.
What does the letter M mean on a Bulova?
M is the decade code for the 1960s. The digit after it gives the year: M0 = 1960, M4 = 1964, M9 = 1969. Bulova assigned one letter per decade and skipped O, Q, R and S to avoid confusion with numbers and similar characters.
Does the date code date the whole watch?
It dates the case and the movement it is stamped on, which is the best estimate of when the watch was assembled. It is not proof of authenticity and does not prove the case, dial and movement all started life together. A serviced or married watch can carry parts from different years, so read the code alongside the styling.
How do I date a Bulova made before 1950?
From about 1924 to 1949 Bulova used stamped symbols, not letters, and these appear on the movement. Some symbols repeat across decades — the 1925 mark can look identical to 1934 — so the decade has to be confirmed from the case, dial and hand style. Compare the symbol against a dedicated chart such as the one on myBulova.com.
Why does my Bulova have no date code?
The code may have worn away, been stamped faintly, or sit on the inside of the caseback. On many modern quartz Bulovas the two-character code is applied inconsistently or left off, and some cases only carry a model reference. If there is truly no code, use the movement caliber, model reference and overall styling to estimate the era.
Can a date code prove my Bulova is genuine?
No. A date code tells you when a case or movement was made, not whether the watch is an authentic, unaltered Bulova. Codes can be re-stamped and counterfeits copy real markings. Use the code to establish age and to check the era matches the design, then confirm authenticity through the movement, the finishing, and where possible a watchmaker.
What year is a Bulova with code L7 or N2?
L7 = 1957 (L = 1950s, digit 7) and N2 = 1972 (N = 1970s, digit 2). Every 1950-onward code works this way. If the letter is A it is ambiguous — usually the 2000s, but a few late-1940s models also used A — so confirm with the styling.