Seiko Cal. 4428 - 722

The Seiko 4428-722 represents an important milestone in Seiko's 1965 lineup. Powered by the 4428 caliber with 18j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-283ef53a4469]

Also known as: Silverwave, Crown

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

43mm

Case Thickness

14.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Burgundy

Jewels

18j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1965

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