Released in 1981, the Cal. 5620 with design code 601 was part of Seiko's domestic market collection. Powered by the 5620 caliber with 25j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-1d4c2126d6f2]
Also known as: Tuna, Sportsmatic
