Seiko Cal. 6638 - 620

This Quartz model from 1966 features a 37mm PVD Black case. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-8e162e549ad2]

Also known as: UFO

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1966

Related Models

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• Seiko 6229-355
• Seiko 6653-464
• Seiko 6655-463
• Seiko 6633-923