Sotheby's employees hold a "Return of the Jedi" promotional C-3PO Helmet 1983, estimated at £15,000-£25,000 created by George Lucas' visual effects company and a prototype of an Imperial Stormtrooper helmet 1976, estimated at £30,000-£60,000 created for the first "Star Wars" film during a photocall at Sotheby's in London, Britain December 6, 2019. REUTERS/Thomas Mukoya