Seiko Cal. 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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