Seiko Cal. 5631 - 781

The Seiko 5631-781 represents an important milestone in Seiko's 1981 lineup. The Coin-Edge bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-84a4995bb70d]

Also known as: Bullhead, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

9.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Cream

Jewels

32j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1981

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