Seiko Cal. 5640 - 851

This Solar model from 1978 features a 44mm Stainless Steel case. With its 18mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-18903d16f5a7]

Also known as: Monster

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

14.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Navy

Jewels

28j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1978

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