Seiko Cal. 4428 - 634

The Seiko 4428-634 represents an important milestone in Seiko's 1986 lineup. With its 19mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-3f7d802eb91f]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

15.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1986

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