Released in 1973, the Cal. 6638 with design code 403 was part of Seiko's domestic market collection. Powered by the 6638 caliber with 26j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-c9e2a7aa3d9d]
Also known as: Goldfeather, Sportsmatic
