You didn't post a link to the auction, so any comments on this particular Luger will have to wait for pics or descriptions.
You didn't say if you were interested in shooting or collecting. A good collectible isn't one you'd want to shoot. Pieces break and/or fly off. Irreplaceable pieces (from a colletor's viewpoint).
A good shooter at a reasonable price would be a Russian capture or a VOPO Luger. Most if not all will have had their fragile parts replaced already.
My $.02