Seiko Cal. 4421 - 397

The Seiko 4421-397 represents an important milestone in Seiko's 1981 lineup. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-c2dfb35f3e73]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1981

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