Seiko Cal. 3831 - 987

Seiko 3831-987

This Hand-Winding model from 1969 features a 35mm PVD Black case. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-d45201609fb2]

Also known as: Sportsmatic, Arnie

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
35mm
Case Thickness
8.3mm
Lug Width
20mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
130m
Dial Color
Black
Jewels
20j
Frequency
36,000 bph
Power Reserve
61 hours
Year
1969

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