Lugar's Worth??

A former WWII vet is going into a nursing home, and is selling some of his belonging. One item is a Gesichert 75 German Luger, with 2 clips, and holster. He got the gun when his group over ran a German town. The Germans fled over nite leaving it on a shelf. When he found it, he said it was covered in a flim of grease. His thinking was that it was a new one. I have taken a look at it, and it looks as new as you could expect for a gun this old. The Blueing and barrel and grips are in top shape. The Holster is sort of marroon in color and is in execellent conditon, no cracking. As far as all the numbers matching, that I don't know. My guessing is that they are. Or did the Germans switch parts alot of the time? Its a 30 cal.and has like a 4 in. barrel. The serial number is 6175. The owner has only fire several rounds through it, in all the years that he's had it. I don't know alot about the Luger's, but I'm a WWII nut and would like to purchase it. Could I get some idea's on what this gun might be worth.

Thanks!