I wrote to the production company to obtain Cree Summer's autograph and what arrived were these preprinted items.  Oh well!  Nice if they were real ... I did obtain Cree's signature later on. 

Left:  Gay Auttersia (Wiggy), Mel Blanc (Dino), Mitzi McCall (Penny), Lenny Weinrib (Moonrock), Michael Sheehan (Bamm Bamm) and Pebbles (I can't make out the voice artists). 

Right: Mel Blanc (Captain Caveman), Daws Butler (Yogi Bear), Daws Butler (Huckleberry Hound), Don Merrick (Scooby Doo), Mel Blanc (Barney Rubble),  and Henry Corden (Fred Flintstone)

Bottom: A Droopy animation cel actually signed by Bill Hanna and Joe Barbera