Released in 1971, the Cal. 5636 with design code 131 was part of Seiko's domestic market collection. Powered by the 5636 caliber with 28j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-e79f7c1e5a7c]
Also known as: Pogue, Bullhead
