Seiko Cal. 3830 - 931

This Spring Drive model from 1974 features a 36mm Hardlex-Coated Steel case. Powered by the 3830 caliber with 28j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-655a106fd7bb]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1974

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