rpbcps is correct that the year of manufacture is 1922.
Ron is also correct that it's a 1906 W+F or P'06 W+F as Gortz & Sturgess call it.
The receiver stop lug on your Luger should have the last three digits of the serial number stamped on it and the last two digits on the rear toggle link and small parts.
You have a very nice Swiss Luger. Enjoy it.
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