Seiko Cal. 6637 - 406

The Seiko 6637-406 represents an important milestone in Seiko's 1977 lineup. The Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-ed57235488ed]

Also known as: UFO, Sea Horse

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

28j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1977

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