Seiko Cal. 6637 - 287

The 6637-287 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-96bede8229ba]

Also known as: UFO, Goldfeather

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

60m

Dial Color

Champagne

Jewels

23j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1971

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