Seiko Cal. 4447 - 728

The Seiko 4447-728 represents an important milestone in Seiko's 1966 lineup. It features a Black dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-1c065e89689d]

Also known as: Bullhead, Helmet

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1966

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