Requesting Help to Identify/Verify an Old Luger

[BergThornson]

Interesting! Assuming that this is really early model sold then. Love finding out all this information about it.

This Luger dose not have any other stamps, Including not having the "GERMANY" stamp on the frame. So its safe to assume that this gun was purchased in Germany itself.

But now I'm curious why the bottom frame has a " 4 " stamped on the inside of it, right below the barrel. Could this be from a different gun?

And another question out of curiosity; how often did German Soldiers and/or did their respective family members buy a pistol for The Great War? (If it did happen)
I know of American Soldiers and Marines themselves when heading overseas. To ensure they at lest had a pistol with them from home.