Released in 1999, the Cal. 5638 with design code 204 was part of Seiko's domestic market collection. Powered by the 5638 caliber with 29j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-9e91a75c2ebf]
Also known as: Goldfeather, Sportsmatic
