The crown over N is the nitro commercial firing proofs, showing that it could safely fire modern powders. The takedown lever does sound like a replacement part, but perhaps the 6 is blurred from wear and looking like a 2. Meaning it could be a matched part that is being difficult to read.
The script letter "o" after the 26 is part of the serial #. So your correct # is 26 "o".
Finish is rather rough, yet original, still better than a reblue.
The Germany stamp shows it is commercial, and possibly for export. But commercials are numbered like yours anyway, a lot fewer serial #s showing than on a military model.
The safe bet for ID is to call it a 1920 Commercial.
Post WW1, some from new parts, some from reworks, some from old parts. Yours looks like new manufacture at the time, though.
Value would depend on your local market, but I would guess at least $650 or so, in the Denver markets that I am more familiar with, but only if that takedown lever actually matches.
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www.lugerforum.comGreat folks, and a lot of info there.