Seiko Cal. 5638 - 661

The Seiko 5638-661 represents an important milestone in Seiko's 1977 lineup. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-0756b1cb6bdd]

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

170m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1977

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