Released in 1984, the Cal. 5641 with design code 771 was part of Seiko's domestic market collection. Powered by the 5641 caliber with 30j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-b8c8c3c1cad8]
Also known as: Sea Horse, Golden Tuna
