Seiko Cal. 6639 - 906

This Spring Drive model from 1980 features a 35mm Stainless Steel case. Powered by the 6639 caliber with 19j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-a24f3c2a084f]

Also known as: World Timer, Navigator

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

13.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1980

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