Where To Find Your Watch Case Reference Number

SEIKO and CITIZEN watches have the case reference number on the case back and are usually a mix of alphanumeric numbers and a hyphen.

SEIKO Example –
6139-6002 (6139 is the caliber number, 6002 is the case number)

CITIZEN Example –
4-901045 TA
CITIZEN caliber numbers aren’t always on the caseback.

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