From Muppet Wiki

Western Publishing released a series of "Magic Slate Paper Saver" toys featuring Sesame Street characters from the 1970s through the 90s. These were originially published under the Whitman brand, and later under Golden Books. Each slate is a piece of stiff cardboard, with a sheet of cellophane over a soft waxy surface on the front. Using the included red plastic stylus, a child can draw on the cellophane, and then lift the page to erase and start over.

Some of the illustrations at the top of the slates were provided by Sesame storybook artists, including Michael Smollin, the illustrator of The Monster at the End of This Book.

1976, Bert and Ernie Michael Smollin	1976, Big Bird and Little Bird Michael Smollin	1977, Herry Monster	1977, The Amazing Mumford
1979, Biff and Sully Michael Smollin	1979, Sherlock Hemlock	1981, Big Bird and Little Bird Tom Cooke	1981, Cookie Monster
1981, Ernie	1981, Farmer Grover	Cookie Monster Michael Smollin	Count von Count Michael Smollin
Count von Count	Grover Michael Smollin	Oscar the Grouch Michael Smollin	1985, Bert
1985, Big Bird and Little Bird	1985, Ernie	1985, Oscar	1985, Oscar (Follow That Bird tie-in)
1988, Grover	1990. Bert and Ernie	1990, Bert, Ernie, Grover and Elmo	Big Bird and Radar
Cookie Monster	Grover	Oscar	Marshal Grover
Elmo	Big Bird, Bert, and Ernie