This is from the 1977 animated special "A Flintstone Christmas". Both the cel and the background are hand painted. This set measures approximately 35.5" x 13.5".
I had another cel very similar to this one, with slightly different colors, so I suspect that they were used as color checks. The cel is in great condition. It has been stored carefully. The only thing I notice are some small xerographic lines on the back reindeer right above their leash lines. They is not really noticeable from a distance but you can see them in the pictures.
Overall, a really great unique piece from the hand painted animation era. My mother worked in the animation industry Disney, Hanna Barbera, Bakshi... For decades and collected many items. This is from her collection. She obtained this item in the late 1970s while working at Hanna Barbera.
Please ask questions if you have any. The item "Large Hanna Barbera Santa Sleigh with Reindeer Flintstone Xmas Animation Cel'77" is in sale since Wednesday, April 04, 2018. This item is in the category "Collectibles\Animation Art & Characters\Animation Art\Production Art". The seller is "jbeski" and is located in Bend, Oregon. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica.