Seiko Cal. 6631 - 616

This Automatic model from 1981 features a 42mm Hardlex-Coated Steel case. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-479cf78de2a5]

Also known as: Monster, Flighty

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1981

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