Patek Philippe serial numbers, and how they date a watch.
A Patek carries more than one number, and the one that dates the watch is not the one most people look for. This guide explains the case, movement, and reference numbers, how the movement number gives you an approximate year, and how the official Archives confirm it exactly.
Since 1839 every Patek timepiece has been given its own movement number, with the production date recorded in the company Archives. That record is the closest thing to a birth certificate a watch has.
Last updated June 2026 · maintained by MODA Watches
Can you date a Patek Philippe by its serial number?
Yes, but use the movement number, not the case number. Patek has assigned every watch its own movement number since 1839, and those numbers rise over time, so a dating guide turns yours into an approximate production year. For the exact date, order an Extract from the Archives, the official factory record.
Approximate year from a movement-number guide, exact date from the Archives. A valid number alone does not prove a watch is genuine.
A Patek has several numbers, not one
People say serial number as if there is just one, but a Patek carries three distinct numbers, and they do different jobs. Knowing which is which is the first step to dating or verifying the watch.
-
Engraved inside the caseback
The case number
This identifies the case. On a solid caseback it is engraved on the inside surface. On a watch with a sapphire crystal back, look for it within the metal ring that holds the crystal. It is recorded in the Archives alongside the movement number, but on its own it does not date the watch.
-
Engraved on the movement
The movement number
This is the one that matters for dating. It is engraved on the movement itself, so a watchmaker usually has to open the watch to read it. Every Patek has had its own unique movement number since 1839, and Patek recorded the production date for each one. Movement numbers increase over time, which is what makes dating possible.
-
The model, not the individual watch
The reference number
The reference identifies the model, such as a Calatrava or a Nautilus configuration, not your specific watch. Two identical watches off the same production line share a reference but have different case and movement numbers. The reference tells you what the watch is, not when it was made or whether yours is the genuine article.
How the movement number dates the watch
Because Patek has numbered movements in sequence since 1839, and because those numbers climb steadily as production continues, the movement number works as a rough timeline. A later movement number means a later watch. Collectors and reference guides take this idea and map ranges of movement numbers to the years in which they were produced, so when you find your number on a movement-number dating guide, you land on an approximate production year.
A few things to keep in mind. The result is an estimate, not an exact date, because production for a given range of numbers can span more than a single calendar year. The case number is no help here, so make sure you are reading the movement number, which usually means having the watch opened by a watchmaker. And the guide only gets you close. The chart in the next section maps movement-number ranges to an approximate era, but for the precise year, and for the rest of the factory record, you need Patek's own Archives.
Movement numbers by approximate year
Patek has recorded every movement number since 1839, but it has used more than one numbering sequence over its history, and the case number and movement number are not the same. So a number places a watch in an era, not on an exact date. For the exact production date, the movement number goes to the Extract from the Archives.
| Approximate year | Movement number (approx.) |
|---|---|
| Before 1900 | up to ~100,000 |
| 1900s | ~110,000 to 175,000 |
| 1910s | ~150,000 to 190,000 |
| 1920s | ~190,000 to 200,000 (an ~800,000 series also began) |
| 1930s | ~820,000 to 835,000 |
| 1940s | ~835,000 to 866,000 |
| 1950s | ~867,000 to 888,000 |
| 1960s | ~889,000 to 1,130,000 |
| 1970s | ~1,250,000 to 1,350,000 |
| 1980s | ~1,450,000 to 1,850,000 |
| 1990 and later | ~1,850,000 and up |
Approximate ranges compiled from dealer and collector data, not an official Patek source. Patek ran parallel numbering sequences and modern pieces carry much higher numbers, so use this as a guide and confirm the exact date with the Extract from the Archives.
The Extract from the Archives is the exact record
A dating guide gets you within a year or two. The authoritative route is the official Extract from the Archives, the document Patek issues from the production records it has kept since 1839. You order it through Patek's official website or an authorised retailer. It costs roughly 500 Swiss francs and is generally available for watches more than ten years old.
The Extract is far more than a date. For your specific watch, it states:
- Movement number as recorded at the factory
- Case number matched to that movement
- Reference number of the model
- Case material the watch was made in
- Dial description as it left Geneva
- Strap or bracelet type originally fitted
- Exact production date from the Archives
- Original sale date on record
That last detail set is what makes the Extract so valuable when buying or selling. It confirms the watch left the factory in the exact configuration it wears today, which is the heart of verifying a Patek.
A valid number is not proof. Verify before you buy or sell.
Here is the trap. A movement number that lands neatly on a dating guide does not prove the watch is genuine, and it does not prove the case, dial, and movement belong together. Numbers can be transposed onto the wrong parts, dials can be swapped, and a stolen watch wears a perfectly valid number. The only way to be sure is to check the number against the brand's own factory record.
That is exactly what a MODA Serial Check does. It runs your Patek through the brand database to confirm the factory record behind the number, so you know what the watch is supposed to be before any money changes hands. If you are selling a Patek, the same confirmation lets a buyer move quickly and pay with confidence. And if you want to know what the watch is worth at today's market, MODA-lytics tracks live pricing across the luxury market.
The guide gets you close. The database makes it certain.
A MODA Serial Check confirms the factory record behind your Patek's number and sends the report to your phone. It tells you whether the number checks out against the brand's records and whether the watch has ever been reported stolen, so you can buy or sell without guessing. MODA covers Patek Philippe, and we both buy and sell Patek when you are ready to move the watch.
Common questions
What people ask about Patek Philippe serial numbers, answered plainly.
Source: movement-number ranges are compiled from published production data and are approximate. The definitive record is Patek Philippe's official Extract from the Archives.