Seiko Cal. 4418 - 637

The Seiko 4418-637 represents an important milestone in Seiko's 1990 lineup. With its 20mm lug width and 12.1mm profile, it sits comfortably on most wrists. [seikata-wm-22cbbdc58ea7]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

12.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

140m

Dial Color

Green

Jewels

26j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1990

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