Seiko Cal. 3831 - 731

Seiko 3831-731

This Automatic model from 1979 features a 42mm Hardlex-Coated Steel case. Powered by the 3831 caliber with 32j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-70d7208cca64]

Also known as: UFO, Baby Tuna

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
42mm
Case Thickness
10.6mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
180m
Dial Color
Silver
Jewels
32j
Frequency
21,600 bph
Power Reserve
53 hours
Year
1979

Related Models

seikata-wm-70d7208cca64