I recently loaned money to a friend who has an FFL. He knows that I collect WWII small arms, and has offered this Luger P08 as partial payment. It has both copies of the bring back certificate with it. The pistol is all numbers matching and marked 1915 DWM.

I don't know much about Lugers so any help with the hallmarks and a rough value is appreciated. Thank you!

https://imgur.com/a/amMROHm