Seiko Cal. 3831 - 306

This Spring Drive model from 1992 features a 43mm Hardlex-Coated Steel case. Powered by the 3831 caliber with 18j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-31cb1b33cd9f]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

60m

Dial Color

Green

Jewels

18j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1992

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