A seller brings in an ancient hand cannon so old and so rare, even the experts struggle to determine its origin and history. Also a mystery is a tiny jewel-encrusted gold pencil that might just be Faberge. Meanwhile, Delfino struggles to revive a 90-year-old sour-sounding player piano and a woman brings in a dreary painting her aunt left her that she can't wait to get out of her house ... only to get a big surprise on auction day.