Seiko production date calculator
The watch in the photo
May 1984
The movement number is the first four digits of 6309-8930, so 6309. The serial number is 455367. Its first digit, 4, is the last digit of the year. Its second digit, 5, is the month. Seiko made watches with movement number 6309 from 1976 to 1988, and the only year in that range ending in 4 is 1984.
This date is an estimate worked out from Seiko's serial numbering, and it can be wrong. It is for information only: no rights can be derived from it, and we accept no liability for how it is used.
