Released in 1966, the Cal. 4538 with design code 299 was part of Seiko's domestic market collection. Powered by the 4538 caliber with 21j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-d7e8c6e99b7a]
Also known as: Sumo, Bellmatic
