Seiko Cal. 6631 - 640

This Spring Drive model from 1977 features a 46mm Hardlex-Coated Steel case. The Fixed bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-6af99fffe58f]

Also known as: Pogue

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

12.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1977

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