Seiko Cal. 3831 - 915

Seiko 3831-915

This Automatic model from 1975 features a 36mm Hardlex-Coated Steel case. The Inner Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-d2230cb5062a]

Also known as: Sumo, UFO

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
36mm
Case Thickness
8.3mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
150m
Dial Color
Champagne
Jewels
36j
Frequency
21,600 bph
Power Reserve
36 hours
Year
1975

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