Seiko Cal. 6639 - 828

The Seiko 6639-828 represents an important milestone in Seiko's 1977 lineup. The Coin-Edge bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-bfb34283d834]

Also known as: UFO, Golden Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

9.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Green

Jewels

33j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1977

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