Seiko Cal. 5631 - 791

The 5631-791 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5631 caliber with 29j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-de70feed6b2e]

Also known as: Bullhead, Flighty

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

90m

Dial Color

Cream

Jewels

29j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1998

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