Seiko Cal. 6638 - 764

This Spring Drive model from 1992 features a 37mm PVD Black case. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-4917c7f6d0a0]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1992

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