Question for the postcard cognoscenti

[Exhibitman]

I picked this up thinking it was a 1922 Eastern Exhibit but it is on the wrong stock for an arcade card and has no listing on tbe back for the company, Eastern or Chicago. The stock is the same feel and thickness as most every postcard I have from the era. I realize it is the same artwork as the Exhibit cards but I am stumped as to how to properly classify it. My view at this point is that it is a PC not and arcade card, not part of the Exhibit set, and that it likely means that the PC maker either became the Eastern company or transferred its artwork to the Eastern Exhibit Supply Co., which then transferred it to the ESCO we all know and love, resulting in the identified card backs. So, PC guys, what do you think/know, and fellow Exhibit fans, do you have cards like this on thin postcard stock with no identifying lines on the backs?