Released in 1991, the Cal. 5683 with design code 931 was part of Seiko's domestic market collection. Powered by the 5683 caliber with 36j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-453e4f80c3d6]
Also known as: Sportsmatic, Baby Tuna
