Seiko Cal. 4427 - 657

The Seiko 4427-657 represents an important milestone in Seiko's 1978 lineup. The Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-1c200e1a2ded]

Also known as: Tuna, Emperor

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

15.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1978

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