Released in 1973, the Cal. 5688 with design code 177 was part of Seiko's domestic market collection. Powered by the 5688 caliber with 23j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-1ae5e3f9dbb9]
Also known as: Bellmatic, Golden Tuna
