The 30 Luger aka as 7.65mm is not a rare cartridge, just more expesnive because less are sold than the 9mm. resale on a 30 luger is usually less than a 9mm, and I think that $950 is about $200 too much, at least for me...
Like most things, is it all matching, is it correct, is it what?
if dated 1920, it was marked by the reichswehr as a gov't owned weapon and WAS almost certainly at one time 9mm...
I am unsure why this was posted in the p08 section if it has no military markings?