Seiko Cal. 4423 - 900

This Hand-Winding model from 1965 features a 41mm Stainless Steel case. Powered by the 4423 caliber with 30j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-2487c2468f95]

Also known as: Sportsmatic, Arnie

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1965

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