Seiko Cal. 6639 - 640

The Seiko 6639-640 represents an important milestone in Seiko's 1967 lineup. The Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-dd52bee6f868]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

50m

Dial Color

Green

Jewels

34j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1967

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