Rolex Clasp Codes & End Links: Verify a Bracelet from Japan (2026)

When you buy a pre-owned Rolex from Japan, you judge the bracelet from photos alone—you cannot open the clasp or weigh the links in your hand. Two small markings let you check it remotely: the rolex clasp code stamped inside the clasp, and the end link code or bracelet reference where the bracelet meets the case.

Read together, they answer three questions a seller’s price never will: roughly when was this bracelet made, does it belong on this reference, and has it been swapped or serviced? None of that proves the watch is authentic on its own—but a bracelet that does not line up is one of the cheapest red flags to catch before you commit.

This guide explains how to read a rolex clasp code, gives a year chart for 1976–2011, maps the common end link codes to their bracelet references and models, and turns all of it into a photo checklist you can send a Japanese seller. It is written for buyers importing from Japan; the markings are the same worldwide, but the remote-buying workflow is the point.

One caveat first: these codes are corroborating evidence, not certificates. Letter-to-year assignments vary slightly between published references, service parts exist, and the only body that can confirm a Rolex is genuine is Rolex. Treat every reading below as a cross-check, current as of September 2026.

What a rolex clasp code is (and what it cannot prove)

A rolex clasp code is a date stamp for the bracelet’s clasp—not for the watch head. Rolex stamped a code inside the clasp of steel bracelets that records the month and year the clasp was manufactured. It tells you the age of that clasp, which is useful precisely because bracelets are the most commonly swapped, replaced, or serviced part of a vintage Rolex.

That distinction is the whole reason the code matters to a remote buyer:

• The code dates the bracelet, not the watch. A 1988 clasp on a watch whose reference and serial point to 1985 is not automatically wrong—but the gap needs an explanation.
• A matching-era clasp supports originality; it never proves it. Clasps can be sourced to match, and service bracelets are genuine Rolex parts.
• No code at all is not a red flag by itself. Gold and precious-metal bracelets often carry purity hallmarks (for example “750” for 18k) instead of the letter date code, and codes were phased out after 2011 (see below).

In short, the clasp code is one input in a franken-check, alongside the reference number, the serial, the dial, and the papers. Use it to flag inconsistencies, not to declare a verdict.

How to read a rolex clasp code: letter = year, number = month

The format is simple once you know it: one or two letters for the year of manufacture, followed by a single digit (1–12) for the month. A clasp stamped OP9 was made in September 2006; G3 is March 1982; MA8 is August 2005.

Where to look depends on the bracelet:

• Oyster bracelet: open the clasp fully and read the inside of the swing arm—the flip-up section that folds against the bracelet.
• Jubilee bracelet: the code is stamped on the inside of the folding blade of the clasp.
• Some older pieces also carry markings on the end links themselves rather than the clasp.

Two markings change the reading. A trailing “S” (for example “MA5S”) indicates a service bracelet or clasp—a genuine Rolex replacement fitted at a service center, correct but not original to the watch. And U.S.-assembled bracelets from certain periods used two-digit years instead of the letter code, so not every genuine clasp follows the letter table.

Rolex clasp code year chart (1976–2011)

Rolex used letter date codes on steel bracelet clasps from roughly 1976 to 2011, then moved to randomized codes that no longer read as a date. The table below is compiled from published dealer references; because letter assignments differ slightly between sources, use it to place a bracelet in a period and to flag mismatches—not as a precise birth certificate.

Code	Year	Code	Year	Code	Year
A	1976	N	1989	AD	2003
B	1977	O	1990	CL	2004
C	1978	P	1991	MA	2005
D	1979	Q	1992	OP	2006
E	1980	W	1995	EO	2007
F	1981	V	1996	PJ	2008
G	1982	Z	1997	LT	2009
H	1983	X	1999	RS	2010
I	1984	AB	2000	CP	2011
J–M	1985–88	DE / DT	2001 / 2002	—	post-2011: random

Worked example: a clasp reading X4 decodes to April 1999; K11 to November 1986; CL10 to October 2004. After 2011 the code is scrambled, so on a modern bracelet you cannot date the clasp this way—fall back on the warranty card and the watch’s own paperwork.

End link codes and bracelet references: matching the bracelet to the case

End link codes are effectively part numbers for the small links that join the bracelet to the case. On vintage Rolex bracelets the end links are removable and stamped with a code such as 501B, 555, 580, or 593. In the early 2000s Rolex switched to Solid End Links (SEL); on SEL bracelets the removable code disappears and the bracelet reference number is engraved on the inside of the end links where they meet the case.

Why this matters remotely: the correct end link is specific to the case and bracelet pairing. An end link that does not belong on the reference—or a bracelet reference that never came on that model—points to a replaced or mismatched bracelet. The common steel pairings:

Model (reference)	Bracelet reference	End link code(s)
Submariner 5512 / 5513	7206, 9315, 93150	80, 280, 580
Submariner 16800 / 16610	93150, 93250	501B, SEL
GMT-Master 1675	7836, 78360, 62510H	58, 280, 580, 550
GMT-Master 16750	78360, 62510H	580, 550
Explorer II 16550 / 1655	7836, 78360	58, 580
Explorer II 16570	78360	501B, SEL
Explorer 14270	78790, 78690	558B, SEL
Daytona 16520	78360, 78390	503, 503B, SEL

Two honest limits. First, factory tolerance was loose—some end links (the 501B especially) were fitted across several “thin-case” models, so a shared end link is not a perfect fingerprint. Second, aftermarket and service end links exist, so a correct-looking end link is corroborating, not conclusive. For a Jubilee, the 62510H reference and 555/555B end links are the common vintage sport pairing; on a two-tone or gold bracelet, expect a different reference entirely.

How to cross-check bracelet age against the watch: three signals

Put the two codes next to the watch’s own dating evidence and look for a story that holds together. The order that catches the most problems:

1. Clasp code vs. serial year. Decode the clasp code and compare it to the era implied by the serial and reference. A clasp made within a year or two of the watch is normal; a clasp a decade off needs an explanation (service replacement, parts watch, or a swapped bracelet).
2. End link / bracelet reference vs. model. Confirm the end link code or bracelet reference is one that came on that reference. A 93150 Oyster on a 16610 Submariner is right; a Jubilee reference on a tool-Submariner listing is a question.
3. Link count and total length. A full, unshortened bracelet with all removable links and the correct clasp adjustment holes matters for both fit and value. Missing links are common and negotiable—just price them in.

None of these three is decisive alone. Together they tell you whether the bracelet is period-correct, serviced, or foreign to the watch—exactly the distinction a photo-only buyer needs before wiring money. For reading the case-side markings that anchor step 1, see our guide to Rolex reference numbers and how to verify them against a Japanese listing.

Spotting a mismatched or franken bracelet in a Japanese listing

A “franken” watch is assembled from parts of different origin, and the bracelet is a frequent culprit because it is the easiest correct-looking part to source. The remote red flags:

• A clasp code that predates the movement or reference by many years. Possible on a service watch, but ask why.
• A bracelet reference that never shipped on the model, or an end link code that belongs to a different case.
• A service “S” clasp described as “full original set.” Genuine, but not original—the wording is the problem, not the part.
• Crisp, sharp clasp stampings on a heavily worn watch, or the reverse: a pristine head on a stretched, mismatched bracelet.
• No clasp photo offered. The single most useful image to request, and its absence is itself informative.

The bracelet is only one axis of a franken check; the dial is the other big one. Our guide to spotting a redial or franken watch in a Japanese listing covers the dial side, and the watch reference number index shows how the case markings tie the whole package together.

What to ask a Japanese seller to photograph

Japanese dealers and auction sellers are generally responsive to specific requests, and detailed photos are normal in that market. To verify a bracelet remotely, ask for exactly these shots—vague requests get vague answers:

• The inside of the clasp, opened fully, with the date code readable (swing arm for Oyster, folding blade for Jubilee).
• The underside of an end link where it meets the case, showing the end link code or engraved bracelet reference.
• The clasp crown and any “S” or reference stamps, in focus.
• The full bracelet laid flat so you can judge stretch and count links.
• The case serial and reference (between the lugs on older watches; on the rehaut for post-2005 pieces) so you can run the cross-check above.

Because you are buying at a distance, a genuine card or box is corroborating too—see how to read a Rolex warranty card from photos without over-trusting it. The principle throughout: authentic and authorized are different claims, and a matching bracelet supports the first, never the second.

Why the serial number alone won’t date a modern Rolex

Step 1 of the cross-check leans on the watch’s era, so it helps to know the limits of the serial. From mid-2010, Rolex randomized serial numbers, so a modern serial no longer encodes the production year—you cannot derive a date from it and must rely on the warranty card or Rolex’s records instead. That is exactly why the clasp code is useful on watches up to 2011 and far less so after.

Serial location also shifted, which affects where to ask for photos:

• Pre-2005: serial engraved between the lugs at the 6 o’clock side, hidden behind the bracelet.
• 2005–2008: Rolex added the serial on the rehaut (the inner flange between dial and crystal) alongside the lug engraving.
• From about 2008: new production carried the serial on the rehaut only.

So on a 1990s Submariner you can pair a decodable clasp code with a between-the-lugs serial; on a 2015 model both the serial and the clasp code are random, and dating falls back on paperwork.

Frequently asked questions

Does the clasp code tell me the year the watch was made?

No. It dates the clasp—and by extension the bracelet—not the watch head. A bracelet made within a year or two of the watch is normal; a large gap suggests a service replacement, a swapped bracelet, or a parts watch.

My clasp has an “S” after the code. Is that bad?

No. The “S” marks a genuine Rolex service bracelet or clasp fitted during a service. It is correct and safe—just not original to the watch, so a listing calling it “original full set” is imprecise.

There is no date code on the clasp at all. Should I worry?

Not necessarily. Gold and precious-metal bracelets often carry purity hallmarks instead of the letter code, and bracelets made after 2011 use randomized codes that do not read as a date. Judge it alongside the reference, serial, and end link.

Can a matching clasp code prove the watch is authentic?

No. It is corroborating evidence only. Clasps can be date-matched and service parts exist, so a period-correct bracelet supports authenticity but cannot establish it. Final authentication requires the physical watch and, ultimately, Rolex.

Key takeaways

• A rolex clasp code is one or two letters (year) plus a digit (month), used from 1976 to 2011; it dates the bracelet, not the watch.
• Read it inside the Oyster swing arm or the Jubilee folding blade; a trailing “S” means a genuine service replacement.
• End link codes (501B, 555, 580, 593…) and bracelet references (93150, 78360, 62510H…) should match the model—a mismatch flags a swapped or franken bracelet.
• Cross-check three signals: clasp code vs. serial year, end link/reference vs. model, and link count/length. None is decisive alone.
• From mid-2010 Rolex randomized serials, so a modern serial cannot date the watch—rely on the card and Rolex records.

If you are targeting a specific Rolex reference from Japan, RYUZU WATCHES searches the Japanese market on your behalf and inspects the watch—clasp code, end links, and all—before you commit, so you know what you are buying from photos alone. Tell us the reference you are looking for, or read how our authentication process works.

Sources

This article is general information current as of September 2026 and is not an authentication service. Clasp letter assignments vary between published references and service parts exist—treat the codes as a cross-check. Only Rolex can confirm a watch is genuine.

• Everest Bands — how to decode a Rolex bracelet date code (clasp code format, location, and the “S” service marking).
• Millenary Watches — Rolex end link codes and bracelet reference compatibility chart.
• NW Timepieces — Rolex clasp code year guide (1976–2011 letter-to-year table).
• Bob’s Watches — Rolex serial numbers and production-date lookup (serial randomization and engraving location).