Wow- the directory will let you search by decade. Cool
For the 70's,I have Jean Patou's 1000, Estee Lauder's Private Collection, Diorella and YSL's Opium. I'm tossing between Opium and 1000. Opium is more of an icon of the era and I do love it but 1000 is really better quality.
For the 80's maybe Montaigne or Samsara?