I'm very new to Luger collecting and in need of immediate help.
My goal as a gun collector is probably a little peculiar in that I'm looking to obtain one of each of the major service pieces used in WWI and WWII, rather than a hundred variations of a single gun (if I have enough years and funds left

).
Having secured my 1911, 1911A1 and Garand, an opportunity has arisen to obtain a 1911 Luger from a close friend's father. He has recently decided to sell a number of guns and is broadcasting that fact far and wide, so I'm afraid I don't have the time to do the research I normally would on the topic as the Luger wasn't quite on my radar yet.
The seller states it's a 1911 Luger with a holster and that I need to come see it to answer any other questions. So,......can anyone give me a "down and dirty" list of things (markings, etc.) to check to ballpark the gun's value on the fly?
It has a magazine (don't know if its number or any other of the others match) and a holster. He's asking $1500. Is there a fairly simple way I can tell if the gun is over (or under) priced once I get there?
(I guess this is all silly newbie stuff, but I feel pressed for time as I don't want someone to swoop it and buy a hidden gem out from under me!)
Thanks for any help.