It may have started with a mouse… but it all ended with Scrooge McDuck and Money. Released roughly three months after Disney’s death, in March 1967, it would in theory be the last cartoon short personally supervised by Walt Disney – if he were still personally supervising this sort of thing. I kinda doubt it.
Uncle Scrooge McDuck was, of course, created by Donald Duck comic book writer/artist Carl Barks in 1947. The character was Disney’s most popular original comic book character, and this appearance twenty years after his creation was his first animated “story” on screen.
Unfortunately the film itself is one of those thinly disguised Hamilton Luske educational films the studio would justify producing because they knew they’d make back its production costs with showings on TV and in rentals to schools. It’s said (on Wikipedia) that the film originally was released with The Jungle Book; however that film was released in October. It was more likely paired with the live action The Adventures of Bullwhip Griffin (also March 1967) or The Gnome Mobile (released in July 1967). Disney usually put animated shorts with its live pics and live nature shorts with its animated features back then… but I welcome more information.
Here’s the original pressbook for the film (click to enlarge pages) with everything you need to know about it – the actual entire film is embed below that. Isn’t the internet wonderful?