An original Golden Ticket from Willy Wonka and the Chocolate Factory could sell for up to £20,000 ($A38,521) at auction.
The valuable prop is an important part of the narrative in the classic 1971 film based on Roald Dahl's 1964 novel.
It is how characters Charlie Bucket, Augustus Gloop, Violet Beauregarde, Veruca Salt and Mike Teavee gain entry into the world-famous chocolate factory.
In an auction set to take place on Wednesday (12.06.24), organisers Bonhams are expecting that the prop to sell for between £15,000 ($A28,891) and £20,000 ($A38,521).
"This rare golden ticket was gifted to the vendor in the late 1970s by a family friend who had been working in the film industry in LA during this time," a footnote from the auction house said.
"Director Mel Stuart kept tight controls on the prop Golden Tickets produced for the film and as such they rarely appear on the market, almost all known examples have been from past cast members."
The prop is described exactly as it appears in the film, and the original inscription printed on the ticket is still in tact more than 50 years later.
It is unclear which of the characters the particular ticket belonged to in the film, but actress Julie Dawn Cole, who played Veruca Salt, previously revealed that she had held on to hers after filming and only sold it in 2019 for £15,000 ($A28,891).