Seiko Cal. 6639 - 935

The 6639-935 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6639 caliber with 22j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-ddb1716d6da8]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

10.9mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1983

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