Seiko Cal. 3840 - 931

This Spring Drive model from 1980 features a 36mm Hardlex-Coated Steel case. With its 18mm lug width and 10.6mm profile, it sits comfortably on most wrists. [seikata-wm-75407ffed5f7]

Also known as: Crown, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1980

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