Seiko Cal. 5639 - 154

This Spring Drive model from 1978 features a 45mm Titanium case. Powered by the 5639 caliber with 27j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-b0aa624bfaf2]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Champagne

Jewels

27j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1978

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