Seiko Cal. 6391 - 103

The Seiko 6391-103 represents an important milestone in Seiko's 1990 lineup. The Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-91cc10aa3fc7]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

34mm

Case Thickness

13.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

40m

Dial Color

Green

Jewels

21j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1990

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