Seiko Cal. 6391 - 430

The Seiko 6391-430 represents an important milestone in Seiko's 1984 lineup. With its 21mm lug width and 15.3mm profile, it sits comfortably on most wrists. [seikata-wm-d0015b69bcb8]

Also known as: Sumo, Helmet

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

34mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Burgundy

Jewels

35j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1984

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