Seiko Cal. 5631 - 341

This Spring Drive model from 1974 features a 39mm Two-Tone case. The Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-692f1b84ec8a]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

130m

Dial Color

Black

Jewels

22j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1974

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