Value = Priceless. That pistol cannot be replaced. It is a part of your family. There is a piece of your uncle with that luger. I wouldnt sell it.
I have my grandfathers 1911 (dated 1914, so it was made back in WWI) that he carried in WWII, he was going over seas when he got measles in his eyes, so he never saw combat. The army took him and used him as a DI, he was the DI for the Tuskegie (? spelling) airmen, the black fighter pilots. The gun is not government stamped, so what i have been told is it is a comercial 1911 made in 1914 that was rerouted for government use, then the war ended and the pistols sat. He might have got it issued, but he might have baught it from the armory too, all i know is he carried it during his service. There are lots of stories that go with that gun. Its just about all i have of him, i never met him, and the truck that was his and where he died, i rolled last winter (i am going to restore the truck, but its still sad to lose it that way).
Sorry for the book, i would just say to write down the stories he told you and keep them with that gun. Someday someone in your family maybe your children or his children, or grandchildren will want to know those stories and want to hold that gun.
Jarrod M