Nice find, it is a Vane Jones ICC WB&A articulator kit, reasonably well assembled; those windows are/were a real bear to cut out from the PrestoPlast (all 70 of them!). I have one assembled and one and a half unassembled. The prototype were never painted in an orange scheme, they were delivered from J. G. Brill in forest green and remained that way until being scrapped. A poor photo of mine from the 2005 East Penn meet showing the unbuilt sides:
Another view:
These kits date from around 1948 or so. Mine has a Wagner truck with "48" stamped on it; somewhere I acquired another Wagner truck with '47" stamped on it. I once asked Rich what the numbers referred to, he told me but I never wrote down the answer and now do not remember anymore.