Seiko 4420 Movement Details

Seiko caliber 4420 is a high grade hand winding watch movement. Production started around 1964.
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Sub-brands: Grand Seiko, King Seiko
Day / date?No
GMT / world time?No
Chronograph?No
Rate:18,000 bph
Number of jewels:27
Size / diameter:25.6mm
Height:4mm
Stem code: 354447
Balance wheel code: 310490
Mainspring code: 401680
Screw codes: 012122 (stud screw), 012208, 012211 (dial screw), 012222, 012223, 012226, 012237, 012407 (case screw), 012408, 012547, 012614, 012645, 012707
Development division:Daini (Kameido, Tokyo)

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