The extremely rare Prototypes:

#01-B Mercedes 350 SL (1973 - extremely rare metallic reddish brown prototype with unusual old wheel type)

#08-B Citroen GS (1974 - extremely rare metallic blue prototype  in totally unusual color)

#09-B Fiat Abarth (1973 - extremely rare enamel red variation and maybe a prototype)

#22-C Porsche Turbo (1975 - extremely rare prototype in metallic yellowish green with unusual old wheel type)