Thanks to Daphne at HardysHandyworks I now know what a Blythe doll is! (A little embarrassed as a vintage seller myself that I didn't know about Blythe, I wonder if I've ever passes one up?)
According to Daphne "Blythe was a doll that was made in 1972 by the Kenner toy company.
She was only produced for about a year. Evidently, little girls found her kind of creepy. She has those big eyes and they change color and position when you pull a string on the back of her head.
The dolls are now produced again in Japan and are sought after by collectors from all over the world!
You can read more about Blythe if you are interested at this site:"