Seiko Cal. 6637 - 944

The 6637-944 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6637 caliber with 27j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-f800c18953d6]

Also known as: Samurai, Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

12.9mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1979

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