Seiko Cal. 5639 - 136

This Spring Drive model from 1965 features a 46mm Titanium case. The Fixed bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-4d454d49cbbf]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

46mm

Case Thickness

10.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

70m

Dial Color

Champagne

Jewels

31j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1965

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