Seiko Cal. 6391 - 807

The Seiko 6391-807 represents an important milestone in Seiko's 1975 lineup. Powered by the 6391 caliber with 23j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-fb78420355ca]

Also known as: Helmet, Flighty

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1975

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