Seiko Cal. 6131 - 778

Seiko 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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