Help identify WWI vet's Lugers

[James308]

My ailing father has asked me to help identify, and possibly sell, some Lugers he inherited from his father many many years ago. My grandfather was a WWI vet, and could possibly have brought one or more of these firearms back from the war, but my father thinks more likely he took them as payment for surgery (he was a surgeon in Kentucky until his death in the 1950s). I have tried to educate myself a bit here on the forum, and these appear to be P08 "Artillery" Lugers made by DWM.

One is stamped 1915
One is stamped 1918
One has no date stamp.
The serial numbers all seem to match (last two digits) on all the parts.

I apologize for their messy condition. They have a lot of dirt and cosmoline on them and I didn't want to do any aggressive cleaning that might harm them. I intend to have a gunsmith give them a thorough cleaning and assessment in the near future, but first I wanted to find out more about them and their potential best use or value (are these "hangers" or "bangers")? There are also a couple of snail drums and a loader with the collection, plus a receiver only. Any information or recommendations would be greatly appreciated.

James