Seiko Cal. 5637 - 336

This Spring Drive model from 1969 features a 40mm Stainless Steel case. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-f6ce0ef60d2d]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1969

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