[ithacaartist]

Welcome to the forum, Jason. It's easier to ballpark value a pistol if we can see a comprehensive set of photos. The condition of whatever finish remains would be easier to assess. In the meantime, the shortcomings you've mentioned so far are not major. Some collectors are sticklers about matching number grips; others, not so much. And it is likely you can scare up a grip screw with the Erfurt proof, as well as an Erfurt mag. (Original mags for your gun would, I believe, be constructed of nickel plated steel with walnut bottom, numbered and appropriately proofed. I think yours may have an after market, or a messed-with commercial mag--which were not numbered. Firing pin matching, too? My spidey sense says that $1k might be a little high, it is near top end of shooter range. You can find a Luger nicer than this one sounds for the same $--possibly right here in the WTS section of the forum. Let's see what others have to say...