Mike may be right, I didn't look that close. I was thinking more of the "bring back" aspect.
If it is a "Khyber Pass copy" then to me bringing home that rifle would be more valuable then an unmodified M1917.
Can you imagine years from now, some guy dragging out grandpa's Khyber Pass made rifle. The history alone would be priceless.
Guess that's the Military History Buff in me showing.
Here is the lettering on my M1917 to compare with the OP's. One would have to really examine the rifle to tell for sure but I think its exciting if it could be a Khyber Pass copy.