Date a Seiko by serial number. How to decode a Seiko serial number to find production date
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Seiko - LCD Digital Calculator Alarm Unworn - Ref C359-5000 - Men - 1970-1979 at auction | LOT-ART
Bid Now: Seiko Calculator Automatic wristwatch chronographwith 30/60-minute counter, 12-hour counter, day of the week (German/English) and date, - March 6, 0123 1:00 PM CET
Vintage Digital Seiko C359 5000 Calculator Watch working | eBay
Seiko Serial Number Decoder. Find the date of a Seiko by serial numnber