Speaking of interesting Disney items which were sold recently, Gunnar Andreassen gave me a heads up about ths Oswald "poster" which was sold on All Star Auctions.

According to David Gerstein:

[Researchers colleagues of mine, authenticated it in Los Angeles: it unimpeachably came "down to us" directly from Norm Blackburn's relatives, who wouldn't have faked it. It was glued into a family scrapbook with other verified 1920s items, though nothing more from Disney.
I suspect it's a kind of color guide; a poster sketch does exist to go with it, though unlike the other Oswald poster sketches, it's never been reproduced.]