Seiko Cal. 6391 - 433

The Seiko 6391-433 represents an important milestone in Seiko's 1971 lineup. Powered by the 6391 caliber with 28j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-757161fb5d13]

Also known as: Bullhead, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

14.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

110m

Dial Color

Champagne

Jewels

28j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1971

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