Released in 1966, the Cal. 5610 with design code 629 was part of Seiko's domestic market collection. Powered by the 5610 caliber with 36j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-58f9dabe8d2d]
Also known as: Golden Tuna, Baby Tuna
