Cadillac V16 Convertible Queen Mary 1948 1:43 scale Ex Mag Diecast Model Car This Cadillac V16 Convertible (Queen Mary 1948) diecast model car is black & features working wheels. It is made by Ex Mag & is 1:43 scale (approx. 12cm / 4.7in long). This model also comes in its own display case to keep it in perfect dust free condition.