Seiko Cal. 5631 - 158

The Seiko 5631-158 represents an important milestone in Seiko's 1987 lineup. The Inner Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-96c23606e53f]

Also known as: Monster, Emperor

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1987

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