Seiko Cal. 5631 - 106

This Spring Drive model from 1985 features a 37mm PVD Black case. Powered by the 5631 caliber with 18j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-222963002561]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

80m

Dial Color

Black

Jewels

18j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1985

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