Hello Kurt and welcome to the forum!
The "1918" on top of the receiver is the year your DWM Luger was manufactured.
The "1920" mark is a Weimar Republic property mark (not a date) that indicates it was re-worked after WW-I for use by the police agency Don mentioned.
A Crown over "N" mark would be a commercial Nitro proof, which I wouldn't expect to see on a German military firearm. Is it possible that the pistol was re-proofed in Cz at some later time?
Please post pictures. They will help with identification.
Is there a letter under the "1830" serial number on the front of the frame above the trigger guard? If so, it is part of the serial number.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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