"Wielded by both David Prowse" — the Darth Vader actor — "and stunt performer Bob Anderson, this is the primary dueling prop created for Vader's character in both Empire and Jedi," the site says.

The prop, which the auction site described as "the only hero lightsaber" from either film "with verifiable screen use ever to be offered at public auction," is now the highest-priced item from any St...