Here’s a real rarity.
When Ralph Bakshi worked at Paramount in 1967, he produced several theatrical shorts and proposed a dozen more. One of his assignments was to create a pilot based on the classic radio show The Bickersons using the track of a 1940s radio broadcast starring Don Ameche and Frances Langford. Paul Rapp, son of Bickersons creator Philip Rapp, found this previously lost footage and has posted it on You Tube. Note the first half is in pose reel, the second half is finished in (now faded) color:
(Thanks, Jeffrey Gray)