Seiko Cal. 6637 - 662

The 6637-662 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6637 caliber with 18j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-0e6e8b5f466d]

Also known as: UFO, Crown

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

18j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1979

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