G.W.
I just looked at a few of the Lugers on the Simpson site, and came away with the feeling he is using "1920 Commercial" in the old sense of the phrase. The sense that makes Don and Dwight break out in hives
P.S. Look here for a primer that will hopefully provide enough background for you to make up your own mind as to which of Jan Still's classification best suit any given Luger on Simpson's:
http://luger.gunboards.com/showthrea...923-definition