Seiko Cal. 6638 - 783

This Spring Drive model from 1979 features a 38mm Hardlex-Coated Steel case. It features a Silver dial protected by a Acrylic crystal and offers 30m of water resistance. [seikata-wm-21ff7a3a1a46]

Also known as: Arnie

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Silver

Jewels

34j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1979

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