Released in 1975, the Cal. 4547 with design code 900 was part of Seiko's domestic market collection. Powered by the 4547 caliber with 36j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-f6b60a89c9a4]
Also known as: Sumo, Golden Tuna
