Mama Bear from "Goldilocks and the Three Bears" (1939), which started out as a Disney story/production that was handed off to the fledgling MGM Cartoon Studios to do the animation. Condition is excellent, no chipped or missing paint. The cel edges are quite cockled (wavy) which I'm assuming is normal and gets framed out. I don't know the relevance of the blue paper the cel is sitting on, but that's how I found it, so that's how you're getting it. Also including some unused animation cels and papers/tissues.I still don't know the difference between celluloid and acetate so I can't tell you for sure what these are made of, all I know is that they're what Van used to make the animated intro for "I Love Lucy" in 1952. Scratches/blemishes in the plexiglass cover make the cel number.
Bottom right corner hard to read, but. In what looks like black grease pencil.