Seiko Cal. 3878 - 991

This Spring Drive model from 1965 features a 38mm Hardlex-Coated Steel case. With its 21mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-b239d31f51ae]

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

13.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1965

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