An aluminium saucepan lid signed by John Lennon and Yoko Ono is expected to fetch GBP1,200 ($2,340) at an auction in London.
The musical duo signed the lid in felt tip pen at the Institute of Culinary Arts in London in September 1969, where their films were being screened.
The listing for the sale reads, "This lid was obtained on September 10, 1969 at the Institute of Culinary Arts in London where... the couple were doing a 'Bag-In' on stage.
"Each member of the audience was given a lid or baking tray to bang on while being secretly filmed."
The item will go under the hammer at London auction house Christie's later this year (07).