Seiko Cal. 4420 - 427

The Seiko 4420-427 represents an important milestone in Seiko's 1966 lineup. The Inner Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-0f40109a09a0]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1966

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