As far as i understand that the year this type of bowl was created was the year that disney rereleased Cinderella, i believe 1957. Also there was a musical on broadway of Cinderella the same year. So Cinderella was a big trend. And then there is the glass slipper tie in searching for the lady that these 'glass slippers' aka bowls would be a perfect fit(and of course these fit every 1957's lady perfectly) so these round bottomed doubled handled/spouted bowls were called Cinderella bowls. They usually came in a set of 4 nesting bowls. And i will attest that this shape is a great shape to use for food prep. They came in many different patterns and colors thru out the 3 decades they were produced.
A lovely colour - but why is it called a cinderella bowl? Not come across that term before.