Seiko Cal. 6637 - 638

The Seiko 6637-638 represents an important milestone in Seiko's 1968 lineup. The Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-f46053ee37ef]

Also known as: UFO

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

140m

Dial Color

Champagne

Jewels

24j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1968

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