After months of research...I finally discovered the origin of my coach. Apparently, Irv Perch sold the Arisotcrat company to Boise Cascade in 1969. He then went on to build the American Clipper line and Boise Cascade began marketing these Class C Motorhomes. What I don't know is if these early designs were ones that Boise got from Irv Perch with the acquisition...or were they unique Boise designs? I've now discovered several of these coaches on Ford Econoline chassis and I think some were put on Dodges as well. I've also discovered that mine is a 1972 model and not '73 as previously stated. I have not yet discovered another one on a Chevy chassis. Nor have I found one in a condition as good as mine. Thanks to those who contacted me to help unravel this mystery!!