Mattel Barbie dolls from 1966 are highly sought after by collectors. These dolls may also have rooted eyelashes or dark, tanned skin with straight arms depending on the model, such as the 1960s TNT Barbie or the Malibu Barbie. 

Barbie dolls were invented by Ruth Handler, co-founder of Mattel, Inc., an American toy manufacturing company founded in 1945. Handler was inspired to create a three-dimensional version of a career-minded, adult doll after observing her daughter play with paper dolls.

Vintage Princess Barbie Mattel 1966. Twist Turn Doll with bendable knees Barbie. Wearing vintage pretty handmade dress. She has lovely blonde hair and blue eyes. Made in China. 

Vintage Straight Haired Barbie Mattel 1966. Bendable knees. Wearing adorable flower pattern swimsuit. She also has fancy earrings and necklace. Blue eyes and long blonde hair. 

Vintage Curly Haired Barbie Mattel 1966. Bendable knees. Wearing yellow jeweled swimsuit. She has blue eyes and blonde hair with the bang.

 Vintage Barbie dolls have been a beloved toy for generations of children and collectors. They have evolved over the years to reflect changes in fashion, culture, and society, and continue to be a popular and iconic figure in the world of toys and pop culture.