Seiko Cal. 6637 - 620

This Spring Drive model from 1967 features a 36mm Titanium case. With its 18mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-8588f6a9953f]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

180m

Dial Color

Champagne

Jewels

29j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1967

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