Seiko Cal. 4420 - 973

Seiko 4420-973

The 4420-973 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4420 caliber with 28j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-fdb2641bf068]

Also known as: Bullhead

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
41mm
Case Thickness
14.8mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
80m
Dial Color
Cream
Jewels
28j
Frequency
21,600 bph
Power Reserve
63 hours
Year
1978

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