This is a fantastic, one-of-a-kind original drawing of Mudsy and Boo from The Funky Phantom (1971) by animator Bob Singer. Singer worked on numerous Hanna Barbera shows in the 1960's and in the 1970's became the studio's lead character designer. The drawing is on 11" x 14" archival paper. The image measures 7.5" x 8".
This piece was exhibited at the Norman Rockwell Museum in Stockbridge, MA for their 2017 exhibit, "Hanna Barbera: The Architects of Saturday Morning."