Seiko Cal. 3817 - 637

This Spring Drive model from 1971 features a 42mm Titanium case. The Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-c93bdf49cb1c]

Also known as: Bellmatic, World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

14.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

30m

Dial Color

Cream

Jewels

36j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1971

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