A Second World War Rolls Royce Merlin Engine Piston Head Ashtray, mounted on an ebonised base sandwiched between two pieces of perspex and with over fifty one facsimile signatures of pilots, 20cm; a Similar Ashtray, engraved "Never in the Field of Human Conflict was so much owed by so many to so few" Winston S Churchill, MADE FROM A ROLLS ROYCE MERLIN ENGINE PISTON AS USED IN THE BATTLE OF BRITAIN - AUGUST-OCTOBER 1940, 13.5cm (2)