Seiko Cal. 6637 - 939

This Spring Drive model from 1993 features a 37mm Hardlex-Coated Steel case. It features a Blue Sunburst dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-263b2a4bc2ea]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1993

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