The pistol has the mount and
I read the listed forms and think my pistol falls in this catagory,,,
Luger, German model 1914, Artillery model pistol, mfd. by DWM or Erfurt,
having chambers dated 1914 - -1918, bearing Imperial German military proofmarks
& accompanied by original, German mfd., artillery type, detachable
wooden shoulder stocks.
http://forum.lugerforum.com/showthread.php?t=22303