Hello dear ladymurasaki. Well, I never was in Southern CA in the 70's but I love your idea!
You know when I was reading your post there was one fragrance that immediately popped into my mind. BUT.... I was thinking that it doesn't really fit, then I got to the part about the orange trees!
Andy Tauer Orange Star A sunny, orangey, hippy, ambery, bottle of love! Big and Fun!
OR, a very different option;
Heeley Sel Marin, not oranges, but lemons, cedar, and sea spray. Elegant and Contemporary.