There are several non-antique (less than 100 yrs. old) picture-frame makers/designers who frequently adhered a business/brand sticker to a 'finished' framing job , and many of the 1900-1950 items of this type can gather rather large bux from frame collectors .
One American company 'tag' to keep an open eye out for , for example , would be : "Frederick Loeser & Co. Inc ." , out of Brooklyn-New York , cs80 .