Seiko Cal. 0763 - 391

This Spring Drive model from 1976 features a 40mm Gold-Plated case. With its 20mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-e3b18bebaf2c]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1976

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