Released in 1972, the Cal. 7178 with design code 254 was part of Seiko's domestic market collection. Powered by the 7178 caliber with 18j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-9f1125f3a6e4]
Also known as: Tuna, Sportsmatic
