Seiko Cal. 4423 - 637

The Seiko 4423-637 represents an important milestone in Seiko's 1971 lineup. The Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-a3cdee8178d2]

Also known as: UFO, Rally

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

12.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

80m

Dial Color

White

Jewels

23j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1971

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