Seiko Serial Numbers Complete Guide and Date - Millenary Watches
Speedtimerkollektion
Collector Guide Birth-Year Seiko Watches: 1960-1969 - BEYOND THE DIAL
Dating Vintage Seiko and Dating Citizen Watches, how old is my citizen watch?
Old Seiko Watches Value (Identification & Price Guides)
How old is my SNXJ89? It has a 7s26a movement and the serial number begins with a '9', which makes me think it was made in 1999, but apparently displaybacks weren't made
Seiko5] Hi any info on my dad's old seiko? : r/Seiko