It's very likely a collector's item now with some value. Lots of machines were "rebranded", and I would think this one was probably named Cinderella in honor of the animated movie when it came out. That might actually make it doubly valuable. If it's a child's machine, that also puts it into a special collectible category. Having a case with the machine adds considerably to the value, as does mint condition.
I used to have a big book of vintage collectible sewing machines that might have helped identify it. You will probably need to join some of the vintage sewing machine collectors groups to get more info. There are some at
http://groups.yahoo.com . Graham Forsdyke is sort of the master collectible sewing machine guru; try Googling his name and/or international sewing machine collectors society (something like that).