Seiko Cal. 6131 - 778

The 6131-778 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6131 caliber with 31j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-ef6e6f77e4a2]

Also known as: Bullhead, UFO

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

10.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1974

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