Seiko Cal. 5638 - 975

This Quartz model from 1981 features a 42mm Titanium case. The Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-a55530dd60e8]

Also known as: Helmet, UFO

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

42mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

200m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1981

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