Seiko Cal. 6638 - 739

The Seiko 6638-739 represents an important milestone in Seiko's 1981 lineup. The Fixed bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-8f2ebed172cc]

Also known as: Emperor

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

10.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Burgundy

Jewels

21j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1981

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