Seiko Cal. 5631 - 330

This Solar model from 1970 features a 37mm PVD Black case. With its 18mm lug width and 12.9mm profile, it sits comfortably on most wrists. [seikata-wm-c282052bf260]

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1970

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