Seiko Cal. 6637 - 636

Released in 1970, the Cal. 6637 with design code 636 was part of Seiko's domestic market collection. It features a Navy dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-2dc89f2575b0]

Also known as: UFO, Emperor

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

36mm

Case Thickness

14.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Navy

Jewels

21j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1970

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