Seiko Cal. 3866 - 686

Seiko 3866-686

This Automatic model from 1973 features a 40mm PVD Black case. Powered by the 3866 caliber with 18j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-f5ac2f31f0c9]

Also known as: UFO, Flighty

Specifications

Movement
Automatic
Case Material
PVD Black
Case Width
40mm
Case Thickness
12.9mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
100m
Dial Color
Blue Sunburst
Jewels
18j
Frequency
36,000 bph
Power Reserve
50 hours
Year
1973

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