Seiko Cal. 6331 - 971

This Spring Drive model from 1981 features a 35mm Gold-Plated case. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-b149d98c0134]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Burgundy

Jewels

35j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1981

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