Question

what are Cinderella stamps​

Answer 1

Answer:

It resembles a postage stamp but is not used for postal purpose by governmental postal administration.

Hope it helps

Answer 2

Cinderella stamps:

In philately (the study of stamps), a Cinderella stamp is anything similar to a postage stamp. It is however not issued by any government postal service nor is it used for postal services, it simply virtually resembles a postage stamp.

Items like poster stamps, propaganda labels, stamps issued by organizations not recognized by the government fall under the category. They are a very loosely defined lot and are separated on a basis of what they are not.