I used to have two WW1 Lugers. An Erfurt and a DWM (from 1914 and 1917). I sold the DWM to an arfcommer, and kept the Erfurt.
I think they were guns that were captured by the Soviets at the end of WW2 and given to the East Germans. The look re-arsenaled and have definitely been re-blued/finished. So they were never super-valuable Lugers - but I still really like the WW1 history.