Released in 1988, the Cal. 5657 with design code 214 was part of Seiko's domestic market collection. Powered by the 5657 caliber with 19j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-b5a72d58c9f5]
Also known as: Sumo, Baby Tuna
