Seiko 4420 Movement Details

Seiko caliber 4420 is a high grade hand winding watch movement produced from around 1964.

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
Development division:Daini (Kameido, Tokyo)

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