Seiko Cal. 6331 - 790

This Spring Drive model from 1984 features a 40mm Hardlex-Coated Steel case. The Inner Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-3cf45fbd0e03]

Also known as: Arnie

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Silver

Jewels

22j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1984

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