Seiko Cal. 3831 - 578

This Spring Drive model from 1987 features a 39mm Hardlex-Coated Steel case. The Fixed bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-872e1ee30dca]

Also known as: UFO, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

14.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

70m

Dial Color

Cream

Jewels

31j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1987

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