Seiko Cal. 6657 - 431

The Seiko 6657-431 represents an important milestone in Seiko's 1983 lineup. With its 18mm lug width and 11.8mm profile, it sits comfortably on most wrists. [seikata-wm-03f9007162e1]

Also known as: UFO, Arnie

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1983

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