Seiko Cal. 4556 - 931

The Seiko 4556-931 represents an important milestone in Seiko's 1989 lineup. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-5150d0f46ee1]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

45mm

Case Thickness

11.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1989

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