Seiko Cal. 6637 - 976

The 6637-976 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6637 caliber with 20j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-c395682ac7a4]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

10.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1971

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