Seiko Cal. 7139 - 577

This Spring Drive model from 1977 features a 40mm Stainless Steel case. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-a67e3b7bc18a]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Silver

Jewels

34j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1977

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