Seiko Cal. 6639 - 790

The Seiko 6639-790 represents an important milestone in Seiko's 1968 lineup. The Fixed bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-97adc805bed7]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

10.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1968

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