Released in 1977, the Cal. 3881 with design code 602 was part of Seiko's domestic market collection. Powered by the 3881 caliber with 36j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-2984db3e5b9a]
Also known as: Sportsmatic, Baby Tuna
