Panerai serial number checker, one letter, one exact year
Enter the letter from the caseback for a date. You can also enter the BB serial or the OP case number.
This checker does not tell you whether your Panerai is genuine. A caseback marking can be copied onto a fake as easily as it appears on a real one, and only a professional authentication can settle that. Have your Panerai authenticated by an expert
What a Panerai caseback marking actually tells you
A Panerai caseback carries a single letter that gives the exact production year: no letter is 1997, A is 1998, B is 1999 and so on through Z for 2023. It is engraved beside a slashed number giving the watch's position in that year's run. The other markings on the same caseback do not carry a date: the BB serial identifies the individual watch, and the OP number identifies the case type. The PAM reference identifies the model and should never appear on a genuine caseback at all. Panerai has never published this system; the table is reconstructed by collectors and is approximate at its edges.
The letter gives a year, and unusually it gives a precise one. It does not prove the watch is genuine. Where the caseback genuinely helps is in whether its markings agree with each other and with the watch: the letter, the BB serial, the OP case number and the model all have to belong together. One specific mismatch is worth knowing about, because it is a documented counterfeit tell rather than a matter of judgement, and it is covered below.
Panerai caseback markings era by era
| Era | What the marking looks like | Example |
|---|---|---|
| 1998 to 2023, the millesimation letter | A letter, then this watch’s number and the size of its run | T095/500 → 2017 |
| The BB serial number | BB followed by six to eight digits | BB1234567 |
| The OP case number | OP followed by four digits | OP6763 |
| A PAM model reference | PAM followed by three to five digits | PAM00246 |
Compiled from professional authentication reference material and reviewed in-house.
Panerai caseback marking chart code by code
- A1998
- B1999
- C2000
- D2001
- E2002
- F2003
- G2004
- H2005
- I2006
- J2007
- K2008
- L2009
- M2010
- N2011
- O2012
- P2013
- Q2014
- R2015
- S2016
- T2017
- U2018
- V2019
- W2020
- X2021
- Y2022
- Z2023
There is nothing ambiguous about the letter itself: each one means exactly one year. What people get wrong is which marking to read. The BB serial and the OP case number are on the same caseback and neither carries a date; only the single letter does.
Finding the caseback marking on your Panerai
If your caseback gives you no year
Three common reasons, and only one of them is a problem. A watch from 1997, the first year of commercial production, carries no letter at all, which is correct for that year. A watch from 2024 or later sits past the end of the published table, which is also where the alphabet runs out. And if you are reading BB followed by digits, or OP followed by digits, those are the serial and the case number and neither carries a date. The one thing that should concern you is a PAM reference stamped on the caseback: on a genuine Panerai the PAM lives on the papers and the box, not on the back of the watch.
Panerai caseback marking questions
The things people actually ask us about Panerai caseback markings, answered by the team that reads them for a living.
Where is the dating letter on a Panerai?
Engraved on the caseback, beside the case number, usually as a letter and a slashed number such as H/1234. The letter is the year. The number after the slash is the watch's position in that year's production run and is not part of the date.
What does each letter mean?
No letter is 1997, the first year of commercial production. Then A is 1998, B is 1999, C is 2000 and so on in order through Z for 2023. Panerai did not skip the letter I, so I means 2006 rather than being a mistake for J.
My caseback says BB and then digits. Is that the year?
No, that is the serial number for your individual watch. BB stands for Brevetto Brevettato, patented patent, and commercial numbering began in 1997 with BB970001. It identifies the watch, not the year. The letter beside it is what dates the piece.
What is the OP number?
The case reference. OP stands for Officine Panerai and the four digits identify the case type, not your individual watch and not the year. It is the marking most often mistaken for a serial number.
My caseback has a PAM number on it. Is that normal?
No, and it is worth taking seriously. The PAM reference identifies the model and belongs on the papers and the box. On a genuine Panerai the caseback carries the OP case number and the serial, and a PAM engraved on the back is a documented counterfeit tell. It is not proof on its own, but it is a reason to have the watch looked at.
My watch is from 2024 and nothing comes back. Why?
Because the published table stops at Z for 2023. That is a limit of the record rather than a problem with your watch, and it is where the alphabet itself runs out. The papers and the Panerai boutique network will confirm a recent date.
What about a pre-1997 Panerai?
Those are a different world. Panerai made military instruments long before commercial production began in 1997, and those pieces use an entirely different numbering system. They are rare, heavily faked and need specialist authentication rather than a chart.
Does the right letter mean my Panerai is genuine?
No. Casebacks are copied, letters included. What is hard to fake is agreement: the letter, the BB serial, the OP case number, the model and the movement all belonging to the same watch and the same year. That is what an expert check looks at, and it is why one correct marking settles nothing.