Seiko Cal. 6391 - 823

This Hand-Winding model from 1970 features a 40mm Hardlex-Coated Steel case. Powered by the 6391 caliber with 25j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-ab709c3f3617]

Also known as: UFO, Rally

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

25j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1970

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