Seiko Cal. 6639 - 501

The Seiko 6639-501 represents an important milestone in Seiko's 1973 lineup. The Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-c18af87aa578]

Also known as: Helmet, Goldfeather

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

11.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

30m

Dial Color

Black

Jewels

36j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1973

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