Seiko Cal. 4423 - 403

Seiko 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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