Seiko Cal. 5638 - 531

The Seiko 5638-531 represents an important milestone in Seiko's 1969 lineup. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-dc3cb40e5259]

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

80m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1969

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