Don,
You have conveniently pushed a soapbox firmly under my feet.
This Luger is properly described as a
New Model Parabellum, made in 1913.
P08 Commercial with stock lug are made after the military introduction of the stock lug in 1913.
Please see the commentary associated with this link
http://forum.lugerforum.com/showthread.php?t=31901
--Dwight