Seiko Cal. 4550 - 537

The Seiko 4550-537 represents an important milestone in Seiko's 1981 lineup. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-0fb68d832023]

Also known as: Bullhead, Arnie

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

14.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

60m

Dial Color

Black

Jewels

27j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1981

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