Seiko Cal. 5639 - 337

This Spring Drive model from 1967 features a 44mm Two-Tone case. Powered by the 5639 caliber with 25j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-efb15294502d]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

200m

Dial Color

Champagne

Jewels

25j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1967

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