Seiko Cal. 6638 - 831

The Seiko 6638-831 represents an important milestone in Seiko's 1987 lineup. It features a Burgundy dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-18f67958022b]

Also known as: UFO, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

10.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

180m

Dial Color

Burgundy

Jewels

35j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1987

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