This is a 1964 Ponytail Swirl Barbie. They had a limited run of about two years. They were basically the last dolls to represent '50s glamour. It makes them really valuable to collectors.
Common decoration motifs to watch for are palm trees, diamonds, hearts, the classic Barbie high ponytail silhouette, and of ...
In 1964, Mattel purchased the rights to Bild Lilli and ceased production of the doll, though her resemblance to the original Barbie - blue eye shadow, blond ponytail and all - is striking.