Tissot Serial Number Lookup
Where Tissot hides the serial and reference, how to read the T-reference format, why a modern Tissot serial won't give you a production year on its own — and how to date your watch honestly from its reference, movement and papers.
Updated · 6 annotated diagrams · ~8-minute read
The short answer
A modern Tissot's identification code is engraved on the caseback, usually a 9-character Watch-Secure (WS) code beside the small WS logo, and the reference number (e.g. T137.407.11.041.00) sits nearby and on the papers. Here is the honest part: Tissot serials are not publicly date-decodable — the brand dropped sequential dating serials in the 1980s, so today's codes are identity and warranty codes, not year codes. You date a modern Tissot approximately from the reference, the movement (a Powermatic 80 means roughly 2013-or-later) and the model's era. A serial alone never proves authenticity or exact date — pair the serial, the reference and the guarantee card together.
Start here
If you came looking for a "Tissot serial decoder" that spits out a year, the honest answer is that one doesn't exist for modern watches — and any site claiming otherwise is guessing.
Unlike a vintage 1960s Tissot, whose movement serial could be cross-referenced to a rough year, a Tissot bought in the last decade carries a Watch-Secure code built for warranty registration and anti-counterfeiting, not dating. That's not a dead end. The three things that do place a modern Tissot in time are the reference number, the movement inside it, and the model's production era. Read all three together and you can usually pin a Tissot to a two-or-three-year window — and, just as importantly, catch a fake whose numbers don't add up. This guide shows you where to find every code and how to read it.
The "instant serial checker" myth
You will find third-party pages promising to "decode your Tissot serial for a production year". For modern watches this is not possible — Tissot does not publish serial-to-year charts, and the Watch-Secure code is not sequential in a way you can read. The only system that maps a code to a real record is Tissot's own database. Use those sites, if at all, as a rough sanity check, and treat any confident "your watch is from 2019" output with suspicion.
Where to find your Tissot serial and reference
Everything you need is in three places: the caseback, the guarantee papers, and — for older pieces — the movement itself. On a modern Tissot the caseback is the primary source.
Caseback (primary location)
Turn the watch over. A modern Tissot caseback carries the brand line ("TISSOT 1853"), "SWISS MADE", the water-resistance rating, the reference number, and — on pieces made since roughly the mid-2010s — the Watch-Secure (WS) code: a 9-character alphanumeric string engraved to the right of a small "WS" logo. The code deliberately avoids the capital letters O and I so it can't be misread as zero or one. This WS code is what Tissot uses to register the warranty and verify authenticity on its site.
Between the lugs & on the movement (vintage)
On older and vintage Tissots there may be no WS code at all. Instead a serial can appear stamped on the movement plate or bridge (visible only with the caseback open), and on some vintage cases between the lugs under the strap. Movement serials on genuinely old Tissots can sometimes be cross-referenced to a rough production window — but Tissot ended that dating system decades ago, so it applies to vintage pieces only, not to anything you'd buy new today.
Guarantee card & papers
Every new Tissot ships with an international guarantee that records the model/reference, the Watch-Secure code, the authorized dealer and the purchase date. The reference and code on the card must match the caseback exactly. A missing card doesn't prove a fake — genuine watches lose their papers — but a card whose reference or code disagrees with the caseback is a serious red flag.
Decoding the Tissot reference number
This is the code that actually tells you what the watch is — and it's your best cross-check against a fake. A modern Tissot reference is a structured string of number groups after the letter T. Each group maps to something you can verify on the watch.
The prefixes tell you the collection at a glance. Some common current model-line groups:
Model-line groups (first three digits after T)
- 137: PRX (integrated-bracelet sport, quartz & Powermatic 80)
- 120: Seastar 1000 (dive)
- 127 / 116: Gentleman / Chrono XL and related dress-sport lines
- 101 / 099: Le Locle and Le Locle variants
- 063 / 065: classic PR / dress references
Line codes have shifted across catalog generations — always confirm the full reference against Tissot's site rather than assuming a group from memory.
The middle and trailing groups fill in the rest of the specification: the case size and movement variant, the case material (11 is stainless steel; 33 is a yellow-gold-tone PVD/plated finish; other codes cover two-tone and coatings), the dial/variant colour, and the final strap or bracelet code. The single most useful check is simply reading the reference back against the physical watch: a 137 (PRX) code on a watch that isn't an integrated-bracelet PRX, or an "11" steel code on a watch that looks gold, means something is wrong.
Serial vs reference vs Watch-Secure code
These three get confused constantly, so it helps to see them side by side. The reference identifies the model. The Watch-Secure code is the modern unique identifier for your individual watch. A traditional sequential serial — the kind that could once be dated — only exists on older Tissots.
If a seller quotes you "the serial" of a new PRX, they almost certainly mean the Watch-Secure code — useful for warranty, useless for a production year.
How to date a Tissot approximately
Since the serial won't give you a year, you triangulate. Three signals — the movement, the model era, and the reference generation — together usually place a modern Tissot within a few years.
1. Read the movement
Most modern automatic Tissots run a Swatch Group ETA caliber. The Powermatic 80 — based on the ETA C07.111, itself an evolution of the workhorse ETA 2824-2 — runs at 21,600 vph (3 Hz) and delivers roughly an 80-hour power reserve, achieved with a longer mainspring and a lower beat rate; newer versions add a Nivachron anti-magnetic hairspring. The older ETA 2824-2 beats at 28,800 vph with about a 38-hour reserve. Quartz Tissots use ETA or Ronda quartz calibers. The caliber is often printed on the caseback or the movement; the Powermatic 80 first appeared around 2013, so its presence sets an earliest-possible date.
2. Anchor to the model era
Many Tissot models have a known launch year. The current steel PRX with an integrated bracelet, for instance, was reissued in 2021 (the 1978-inspired quartz first, the Powermatic 80 shortly after), so a PRX in that style cannot be older than that relaunch. Le Locle, Gentleman, Seastar and PR100 lines each have their own generational milestones you can look up.
3. Cross-check the reference generation
Tissot revises reference codes across catalog generations. Matching your exact reference to a current or archived Tissot listing tells you which generation it belongs to and roughly when it was on sale. Combine that with the movement and model era and you'll usually land within a two-or-three-year window — which is about as precise as anyone can honestly get without Tissot's own records.
Want the exact date? Only Tissot can give it. An authorized Tissot service center can, in many cases, trace the production information from the reference and Watch-Secure code — the one authoritative way to move from "about 2022" to a specific date.
Scan your Tissot for an instant read
Upload photos of your Tissot including the caseback and reference engraving. Our AI reads the reference, engraving quality and movement against known specs and returns a detailed verdict in under 60 seconds — a fast first pass before you buy or sell.
Start AuthenticationReading the engraving: genuine vs fake
Because the serial can't date the watch, the engraving quality becomes one of your best authenticity tells. Genuine Tissot caseback text is cleanly laser-etched with sharp, evenly spaced characters and correct spelling. Fakes are often shallow, blobby or misaligned, with wrong fonts or spelling slips in "SWISS MADE", "TISSOT" or the water-resistance line.
Cross-reference against the papers: the reference and Watch-Secure code on the caseback must match the guarantee card exactly. A mismatch there outweighs any single visual clue.
What a serial proves — and what it doesn't
A valid Watch-Secure code is necessary but never sufficient. It only proves that a genuine Tissot with that code exists in the records — not that the watch in your hand is that one. Counterfeiters copy real codes from genuine watches onto fakes, so a code that "checks out" means little unless the reference, the physical watch, the movement and the papers all agree with it and with each other.
So a seller who offers "the serial so you can check it yourself" has proven almost nothing. Ask instead for clear photos of the caseback, the reference, the movement and the guarantee card together, and confirm the Watch-Secure code through Tissot.
How to verify your Tissot, step by step
1. Decode the reference against the watch
Start here — it's the fastest disqualifier. Read the reference off the caseback and check each group against the physical watch: right model line, right case material, right dial colour, right bracelet or strap. A reference that doesn't describe the watch you're holding is an immediate stop.
2. Inspect the engraving under a loupe
At 10x, genuine Tissot caseback text is sharp, deep and correctly spelled, with the Watch-Secure code in a font that matches the rest. Shallow, blobby or misspelled text — or a WS code that looks added in a different style — points to a fake.
3. Check the movement
If the caseback is a display back or a watchmaker opens it, confirm the caliber matches the model — a Powermatic 80 or ETA 2824-2 for the automatics, a Ronda or ETA quartz for quartz models. A mismatched or crude movement behind a Tissot dial is a definitive fake tell.
4. Match the papers
Compare the reference and Watch-Secure code on the caseback against the guarantee card character for character, and confirm the dealer stamp is a genuine authorized Tissot retailer. A card that's present but mismatched is worse than no card at all.
5. Verify with Tissot
Register or look up the Watch-Secure code in the warranty section of Tissot's official website, or contact Tissot customer service or an authorized dealer with the code and reference. They can confirm the code is genuine and, through a service center, trace basic production details. Ignore any third-party "instant Tissot serial checker" — Tissot itself is the only authoritative source.
Serial and reference red flags
- ✖ Reference doesn't describe the watch. A 137 (PRX) code on a non-PRX case, or a steel "11" code on a gold-looking watch, means a fake or a parts-swapped Frankenwatch.
- ✖ "Serial proves the year." No modern Tissot code is date-decodable. Anyone selling a watch on a "verified 20XX serial" is either mistaken or misleading you.
- ✖ Code or reference doesn't match the papers. A guarantee card whose reference or Watch-Secure code disagrees with the caseback is a serious warning.
- ✖ Shallow or misspelled engraving. Genuine casebacks are cleanly laser-etched. Fuzzy text, wrong fonts or a mangled "SWISS MADE" line are giveaways.
- ✖ Movement doesn't fit the model. A Powermatic 80 model with a generic quartz or crude clone movement inside is counterfeit, whatever the caseback says.
- ✖ WS code that repeats across listings. Image-search the code; if the same one appears on multiple watches for sale, it's been copied onto fakes.
Frequently asked questions
Where is the serial number on a Tissot watch?
On modern Tissot watches the identification code is engraved on the caseback, usually to the right of the small Watch-Secure (WS) logo. It's a 9-character alphanumeric code that avoids the letters O and I to prevent confusion. On many models the reference number is also engraved on the caseback, and both appear on the warranty card and international guarantee papers. On some vintage Tissots the serial is stamped on the movement or between the lugs instead.
Can I date a Tissot from its serial number?
Not for modern watches. Tissot stopped using sequential, date-decodable serial numbers in the 1980s, so contemporary serials and Watch-Secure codes are identity and warranty codes, not date codes — there's no public chart that turns them into a year. You can still date a Tissot approximately from its reference number, its movement (for example a Powermatic 80), the model's production era, and the papers. Only Tissot's own records can confirm the exact production date.
What does a reference like T137.407.11.041.00 mean?
A modern Tissot reference is a structured code: the T prefix, then a three-digit model-line group (137 is the current PRX), a case/size/movement variant group, a two-digit case-material code (11 is stainless steel, 33 is a yellow-gold-tone finish), a dial/variant code, and a final strap or bracelet code. Tissot doesn't publish an official digit-by-digit key, so treat the breakdown as a well-observed convention rather than an authenticated decoder, and confirm the full reference on Tissot's site.
What's the difference between the reference number and the serial number?
The reference number identifies the model and configuration — for example a PRX Powermatic 80 40mm in steel with a blue dial — and every watch of that exact spec shares it. The serial or Watch-Secure code is unique to your individual watch. The reference tells you what the watch is; the serial tells Tissot which specific watch it is. Both should match the caseback engraving and the warranty papers exactly.
What movement is in my Tissot, and how does it help date it?
Most modern automatic Tissots run a Swatch Group ETA movement: the Powermatic 80 (based on the ETA C07.111, an evolution of the ETA 2824-2) with about an 80-hour power reserve, or the older ETA 2824-2 at roughly 38 hours. Quartz Tissots use ETA or Ronda quartz calibers. The movement narrows the era — the Powermatic 80 first appeared around 2013 — but it dates the caliber generation, not the exact assembly date of your watch.
Does a Tissot serial number prove the watch is authentic?
No. A serial or Watch-Secure code registering as valid only shows that a genuine watch with that code exists in Tissot's system — it says nothing on its own about the object in your hand, because counterfeiters copy real codes from genuine watches onto fakes. Authenticity comes from the serial, the reference, the physical watch and movement, and the papers all agreeing with each other. Pair the serial with the reference and the guarantee card; never rely on any one alone.
How do I verify a Tissot serial number with Tissot?
Use Tissot's official website: register or look up the Watch-Secure code in the warranty/guarantee section, or contact Tissot customer service or an authorized dealer with the code and reference. Tissot or an authorized service center can confirm whether the code is genuine and trace basic production information. Be wary of any third-party site claiming an instant Tissot serial checker — the authoritative source is Tissot itself.
Is a Tissot with no serial or no papers automatically fake?
No. Older Tissots may never have carried a Watch-Secure code, and genuine watches lose their papers over the years, so absence alone isn't proof of a fake. It does remove your easiest cross-checks, so compensate by decoding the reference against the physical watch, inspecting the engraving quality, checking the movement, and having a watchmaker open the caseback. A code or card that's present but mismatched is far more alarming than one that's simply missing.
Important Note
A serial or Watch-Secure code identifies and helps date a watch, but never authenticates it on its own. Combine it with a physical examination of the case, dial printing, movement and engraving — and for any high-value purchase, an in-person inspection by a certified watchmaker is always the gold standard for complete authentication and peace of mind.
Authenticate your Tissot now
Upload photos of your Tissot including the caseback and reference for AI-powered authentication. Get a comprehensive report in under 60 seconds.
Start ScanningFor high-value purchases, we recommend pairing your AI scan with an in-person inspection by a certified watchmaker for complete peace of mind.