From the small thumbnail side view my impression is that it is a fastback and not a notchback model as the 63 was.On the series 63 the unhooking of the rear lateral trunk line would have been visible. .I rather go for a 1941 Cadillac 4 door Series 61 DeLuxe Touring Sedan.Another point is that this one has no rear fender skirts whereas Series 63 cars mostly show them.