Free Tool
Patek Philippe Number Checker
Check a Patek Philippe reference, movement number, and case number for the right format and internal consistency. Patek publishes no serial-to-year table — the definitive check is an Archive Extract, and this tool points you to one.
The three numbers, and where they live
| Reference number | On the caseback, or on paperwork. 3–4 digits with an optional metal-code suffix and /-variant.Identifies the model (e.g. 5711/1A, 3970E, 5164A). Not unique to your watch. |
| Movement number | Stamped on the movement. Visible through a display back, or when the caseback is opened.Patek's own dating reference and the Archive Extract work off this. ~6 digits vintage, ~7 digits modern. |
| Case number | Stamped inside the caseback / on the case.A different number from the movement number. On a genuine watch both are present and consistent. |
Enter the numbers
Patek Philippe does not publish serial-to-year tables, so this is a format and consistency check. The movement number is stamped on the movement; the case number is stamped inside the caseback — they are two different numbers. The reference number identifies the model (e.g. 5711/1A).
Format is a sanity check. The real check is an Archive Extract.
Patek issues Archive Extracts from its own records — kept for every watch since 1839 — confirming the movement number, case number, reference, dial, and date of sale. Order one at patek.com, and get a physical authentication before the money moves. Get a professional authentication →
Why there is no year table
Patek Philippe has never published serial-to-year charts, and its production records are private. Broad collector references put movement numbers into rough decade bands, and this tool uses those only to catch a gross mismatch with the era a seller claims — never as a production year. The Archive Extract is the only document that dates a Patek precisely, because it is drawn from Patek's own ledgers.
The physical tells
Patek finishing is hard to fake: hand-chamfered bridges with mirror-polished anglage, the Calatrava-cross on the crown, razor-sharp applied-gold markers, and — on modern pieces — the Patek Philippe Seal (older watches carry the Geneva Seal, the Poinçon de Genève).
Want the full authentication guide?
Read How to spot a fake Patek Philippe for the movement-finishing checks, the dial and applied-logo tells, the Seal, and how an Archive Extract fits into a purchase — in the order a professional runs them.
Frequently asked questions
- What is the difference between a Patek Philippe movement number and case number?
- They are two different numbers on a genuine watch. The movement number is stamped on the movement and is what Patek's own dating reference and the Archive Extract work from — roughly 6 digits on vintage and neo-vintage pieces, around 7 digits on modern ones. The case number is stamped inside the caseback. On an authentic Patek both are present and both are consistent with the reference and the era. If the two numbers are identical, one was probably copied onto the other.
- Can I date a Patek Philippe from its serial number?
- Not precisely. Patek Philippe has never published serial-to-year charts and its production records are private. Broad collector references place movement numbers into rough decade bands, and this tool uses those only to catch a gross mismatch with the era a seller claims. The one document that dates a Patek exactly is an Archive Extract, drawn from Patek's own ledgers.
- What is a Patek Philippe Archive Extract?
- It is a document Patek Philippe issues from its own archives, which record every watch the company has made since 1839. The Extract confirms the movement number, case number, reference, dial, case metal, and the date the watch was sold. You order one directly from Patek at patek.com. It is the closest thing to an official authenticity and provenance record, though it should still be paired with a physical inspection.
- What are the physical tells on a genuine Patek Philippe?
- Finishing. Genuine Patek movements have hand-chamfered bridges with mirror-polished anglage, and the rotor and bridges are decorated to a standard fakes do not reach. On the outside, look for the Calatrava-cross on the crown, razor-sharp applied-gold hour markers, and the Patek Philippe Seal on modern watches (older pieces carry the Geneva Seal, the Poincon de Geneve). Dial printing is crisp and perfectly registered.