Seiko Cal. 6639 - 912

The Seiko 6639-912 represents an important milestone in Seiko's 1976 lineup. Powered by the 6639 caliber with 23j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-93badbaf08e4]

Also known as: Rally, Silverwave

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Black

Jewels

23j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1976

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