Seiko Cal. 6391 - 766

This Spring Drive model from 1981 features a 38mm Hardlex-Coated Steel case. Powered by the 6391 caliber with 24j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-07f5be07673b]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

10.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Silver

Jewels

24j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1981

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