A 1939 Mercedes-Benz 540 K Spezial Cabriolet A gets top billing at RM Sotheby’s Florida sale next month at Amelia Island, according to the auction company, followed closely behind by an exotic 1962 Ferrari 400 Superamerica LWB Coupe Aerodinamico and a veteran 1911 Rolls-Royce 40/50 HP Silver Ghost Tourer.