Released in 1991, the Cal. 5231 with design code 978 was part of Seiko's domestic market collection. Powered by the 5231 caliber with 34j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-a7d8cdb1d0f9]
Also known as: Goldfeather, Baby Tuna
