Seiko Cal. 4428 - 666

The Seiko 4428-666 represents an important milestone in Seiko's 1969 lineup. Powered by the 4428 caliber with 34j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-1b8cdb53364e]

Also known as: Sumo, Bellmatic

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

10.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

White

Jewels

34j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1969

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