Seiko | Seiko 5 Sports Fifty Five Fathoms Blue JP (Gents) - ShopGMT
Seiko Marks 50 Years of the Watch that Started the Quartz Crisis | SJX Watches
Seiko Quartz 50th Anniversary Models — Plus9Time
A tribute to a watchmaking revolution. The 50th anniversary of the Quartz Astron is celebrated in a limited edition GPS Solar watch. | Seiko Watch Corporation