Guerlain Mitsouko (1919)

Mitsouko, launched in 1919, lives in the bottle Guerlain first made for L'Heure Bleue in 1912: an inverted heart with Art Nouveau scrolls at the shoulders and a hollow, heart-shaped stopper. Because two of the house's classics share the flacon, it is the stopper, not either perfume's name, that makes the bottle recognizable from across a counter. This is the current eau de parfum, still in that shape more than a century on.