Seiko Cal. 6635 - 188

The Seiko 6635-188 represents an important milestone in Seiko's 1988 lineup. With its 21mm lug width and 14.3mm profile, it sits comfortably on most wrists. [seikata-wm-2335fc3dbb87]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Green

Jewels

27j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1988

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