Seiko Cal. 6391 - 938

The Seiko 6391-938 represents an important milestone in Seiko's 1974 lineup. Powered by the 6391 caliber with 20j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-217d57a28b19]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1974

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