Released in 1978, the Cal. 6628 with design code 177 was part of Seiko's domestic market collection. Powered by the 6628 caliber with 32j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-7d1331d6c2f8]
Also known as: Sportsmatic, Baby Tuna
