Released in 1979, the Cal. 4548 with design code 501 was part of Seiko's domestic market collection. Powered by the 4548 caliber with 21j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-d9f417e0a7c8]
Also known as: Shogun, Baby Tuna
