A Fizzgig puppet from Jim Henson's Dark Crystal is being offered in a sale at the Prop Store in London on September 23.
The lot is expected to make �8,000-10,000 ($12,285-15,356).
The Los Angeles Times reports that the puppet is the only known screen-used Fizzgig in private hands.
The Fizzgig is a key figure in the 1982 film, appearing as the pet of main character Kira, and is likely to prove a sensation among fans of the movie.
The sale will also feature Leonard Nimoy's Spock costume from Star Trek.
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