Easter seals (philately)
Encyclopedia
An Easter Seal is a form of charity label
Charity label
A charity label is a label resembling a postage stamp, sold by charities to raise funds. They are generally intended to be used on mail, as a way of advertising the sender's support of the charity's cause....

 issued to raise funds for charitable purposes.

It is applied to the front of mail to show support for particular charitable causes.

Easter seals are regarded as a form of cinderella stamp
Cinderella stamp
In philately, a cinderella stamp has been defined as "Virtually anything resembling a postage stamp, but not issued for postal purposes by a government postal administration..." The term also excludes imprinted stamps on postal stationery.- Types :...

. They do not have any postal validity.
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