They are some of the props associated with many of the classic comedy moments of their age. Dozens of props, costumes and a lifelike llama from Monty Python’s final live show are set to be auctioned.

“Monty Python and the Holy Grail” will return to the big screen this weekend and next week to celebrate the 50th anniversary of its release. The 1975 cult-classic comedy, based ever-so-loosely on the ...