And I want to know the story behind it 
I would have said Chanel 19 as it takes me back to beginning university (my room-mate wore it) or the best year of my life studying abroad (_my flatmate wore it) Just that sort of backbite of zing that it used to have. Goddamn those reformulations 
Now, after not even smelling, let alone wearing Ysatis for about 30 yrs, I blagged a cheapo vintage bottle and it's bloody lovely. If I had to choose today, one to keep forever, it would be that. Only the old vintage though. And only till I get me an old formulation of 19.