Tudor Clasp Codes

Tudor Clasp Codes: A Collector's Reference Guide (2010–2026)

If you've ever turned over a Tudor bracelet clasp and squinted at a two-letter code stamped into the steel, you're not alone. Those small letter combinations are production date codes, and for collectors and dealers they're a useful tool for verifying a watch's history and confirming whether a bracelet is consistent with the case it sits on.

This reference has been compiled by Cotswold Time from watches that have passed through the business over the years. Tudor does not publish official clasp code records, so this guide is based entirely on observed examples rather than any documentation from the manufacturer. It's a working reference, not a definitive rulebook, and we'll continue adding to it as more pieces come through.

 

What Is a Tudor Clasp Code?

On modern Tudor watches fitted with a folding clasp, there is a two-letter code is stamped on the inner blade of the clasp. This code indicates the approximate year the clasp was produced.

The system is similar in principle to the date codes used on Rolex bracelets (single letters running from A in 1976 through to RS in 2010), but Tudor's codes are distinct and don't cross over. Knowing the clasp code helps when assessing a watch. If the case serial number points to a 2021 production date and the clasp reads ZE, that's consistent. If the code is significantly earlier or later, it's worth asking why.

Tudor Clasp Code Reference Table (2010–2026)

Compiled from watches handled by Cotswold Time. No official Tudor records exist for these codes. Examples in parentheses indicate the models on which each code has been observed.

 

A Few Things Worth Noting

The same code can appear across multiple years. RS shows up in 2010, 2012 and 2013. XR runs from 2016 through to 2019. ZE appears on the BB58 in 2021, then on the Pelagos in 2022, and again on the Bronze BB58 in 2026. This isn't necessarily unusual — production runs overlap, and inventory doesn't always move linearly through the supply chain.

The same code can appear on different models within the same year. 2018 shows XR on both the BB58 and the Pelagos. 2025 shows SX on the BB58 and RP continuing on the Pelagos 39. Different models appear to run on separate clasp production batches, which means the code alone doesn't tell you which reference a bracelet came from.

Multiple codes can exist within a single year. 2016 shows at least two confirmed codes (EB and XR) and a possible third (CP). 2023 shows both UZ and RP on the BB58. This likely reflects a code transition partway through the year rather than two simultaneous batches.

The "Steelinox" designation refers to Tudor's stainless steel bracelet material. From 2024 onward, some entries appear without the Steelinox prefix; this is because Tudor introduced new case and clasp materials over the years (such as titanium, bronze, and gold).

A mismatch isn't automatically a red flag. Bracelets are replaced, service clasps are fitted, and watches are sometimes sold with later bracelets as new old stock. Context matters. What you're looking for is a reason to ask questions, not necessarily a reason to walk away.

 

Why This Guide Exists

There's surprisingly little publicly available information on Tudor clasp codes. Unlike Rolex, where the date code system has been well documented by collectors over decades, Tudor's codes remain relatively obscure. Most of what circulates online is anecdotal, scattered across forum threads, or simply incorrect.

This guide is an attempt to bring some of that knowledge together in one place. It's built from real watches, not speculation, and we'll update it as the dataset grows. If you've handled a Tudor with a clasp code not listed here, or a code that contradicts what's shown, we'd genuinely like to hear from you.

 

This reference was compiled by Cotswold Time from watches handled by the business. It is not affiliated with or endorsed by Tudor Watch Company. Tudor does not publish official clasp code records and this guide should be treated as a working reference, subject to revision.

Last updated: March 2026. If you have additional examples to contribute, get in touch.