There's so many.... I'll avoid the yank stuff (not that I don't like classic american cars though)
Land-Rover Series One...... Jensen Interceptor....Volvo P1800S.....Ford Falcon XB Coupe ( The Mad Max car ).... Vauxhall Firenza Droopsnoot...Holden Monaro (most of you guys know it as a Pontiac GTO )... the list goes on....
Classic and old cars are losing its value nowadays. The only time that it holds or increase value is if specific classic cars has to do with history significant, for instance a pink Cadillac owned by Elvis worth much much more while the rest of Cadillac of same year worth almost nothing.
Best time to sell classic cars are during 70's and 80's, not anymore