Seiko Cal. 5637 - 743

This Spring Drive model from 1990 features a 40mm Hardlex-Coated Steel case. The Coin-Edge bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-b8d482866180]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Burgundy

Jewels

35j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1990

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