Seiko Cal. 4520 - 100

The Seiko 4520-100 represents an important milestone in Seiko's 1981 lineup. The Inner Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-a55dde2f91c3]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

12.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

28j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1981

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