Seiko Cal. 5631 - 450

This Automatic model from 1983 features a 38mm Two-Tone case. Powered by the 5631 caliber with 23j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-8c111eda4f7e]

Also known as: Samurai, Monster

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

11.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

80m

Dial Color

Green

Jewels

23j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1983

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