Barling created a separate model numbering system, using 2 and 3 digits, as well as 3 digits with a letter modifier, at the behest of their US distributor, Mr. Nichols. Their model numbers for the home and European market were four digits beginning with a 1.
I'm certainly finding these prices very entertaining, especially when I have almost identical pieces that I've acquired, that are in better condition, for about 1/4 of what these guys are shelling out.