The Archive

Start with the number on the case back.

Type what is engraved on the back of the watch and the archive takes you to the exact reference: its specifications, variants, history and what to look for. Or browse by brand and collection below.

Spaces, dashes and the word “Ref.” are ignored. Partial numbers work too. Which number is the reference?

Browse by brand

Cartier

23 model families · 67 references

Omega

In research · Constellation and Seamaster first

Rolex

In research · Datejust and Day-Date first

Where the number is

Reference and serial numbers are small and often worn. Good light and a phone camera at close range make them far easier to read than the naked eye.

Cartier

Engraved on the outside of the case back. Vintage Paris-era pieces carry a short reference (such as 78086) with a separate serial number; later references use longer alphanumeric codes (such as W51002Q3). Precious-metal cases also carry hallmarks on the back and sometimes the lugs.

Any other brand

The archive documents Cartier in depth today, with Omega and Rolex next.

Can't find it, or not sure what you are reading? Read the case back guide, or write to us with every line from the back.