In the 70's, Mattel's iconic Barbie was facing, ah, stiff competition from other toymakers.
Kenner (now part of Hasbro) tried with Dusty, but she didn't survive the decade. Then again, neither did our next subject.
Ideal, out of Hollis, Queens (Run-DMC's home turf), introduced Tuesday Taylor, originally known as Tiffany Taylor, around 1976. Her gimmick was that her hair could switch from blonde to brunette and back again at her owner's whim. You'll see in the ad montage. One poster on YouTube commented that the name change might've been because of an adult film star named Tiffany Taylor, and Ideal didn't want to be associated with adult movies, understandably.
One of the later ads features, supposedly, a very young, pre-fame Brooke Shields.
The following montage was posted by Ira Gallen (TVdays):
The name change brought with it a cooler ad campaign, but, as noted, Tuesday Taylor's not around anymore.