Released in 1965, the Cal. 6399 with design code 650 was part of Seiko's domestic market collection. Powered by the 6399 caliber with 34j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-7cd3b3a4b8f7]
Also known as: Sumo, Golden Tuna
