Released in 1965, the Cal. 6660 with design code 815 was part of Seiko's domestic market collection. Powered by the 6660 caliber with 26j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-c0dac6f70e8f]
Also known as: Tuna, Goldfeather
