Seiko Cal. 6638 - 899

This Spring Drive model from 1976 features a 41mm Hardlex-Coated Steel case. With its 22mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-f2b4123de4a6]

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

9.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

140m

Dial Color

Silver

Jewels

22j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1976

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