Seiko Cal. 5631 - 290

This Spring Drive model from 1971 features a 36mm Two-Tone case. With its 19mm lug width and 8.5mm profile, it sits comfortably on most wrists. [seikata-wm-d8735b13621b]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

8.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Burgundy

Jewels

34j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1971

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