Seiko Cal. 3830 - 931

Seiko 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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