How do I tell what year my Omega watch was made?

To tell what year your Omega watch was made, first find its serial number. All Omega watches have serial numbers. Those made before 1944 have seven-digit numbers; from 1944 on, the numbers have eight digits. On vintage models, the serial number is engraved on the inside of the case back. On later ones, it’s on the back of one of the lugs. Once you have the number, you can check trusted online resources to learn when it was made. On 1stDibs, find a large collection of Omega watches.