Seiko Cal. 4423 - 403

The 4423-403 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4423 caliber with 18j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-d1c2d2e4072e]

Also known as: Sumo, Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Cream

Jewels

18j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1983

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