Hi Roger, and welcome to the forum.
Your Luger is made up of a mix of parts from different pistols and different eras.
It probably started out as a commercial DWM Luger, but I can't tell more without detailed photos of the markings. I can't tell if the rear of the frame ears is straight or has the Mauser Hump. If it's straight, it could be a DWM frame (Get internal factory inspector markings photographed) or a Mauser frame. If it has the hump, it's a Mauser frame from 1938-1940.
The S/42 on the barrel indicates it was an armorer's part that was sourced from Mauser sometime after 1935. The 8,82 is a bore measurement in mm as quiet1 mentioned above.
Crown/N marks were commercial markings in Weimar and Imperial Germany depending on the crown used. They may also be marks from rework after WW-II by the Russians and East Germans.
We really need good sharp photos of the marks in detail. You need to shoot them with a digital camera using a tripod in natural shaded light. Use the self timer and the closeup setting until you get some in sharp focus.
Post them here individually with about 1024 pixels horizontal resolution.
All Erfurt receivers should be date marked above the chamber. Is your Luger blank there?
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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