Seiko Cal. 6639 - 754

This Spring Drive model from 1973 features a 40mm Stainless Steel case. The Inner Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-5c8b31c4a846]

Also known as: Goldfeather, World Timer

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

12.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

18j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1973

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