Christmas stamp
A Christmas stamp is a postage stamps with a Christmas theme and intended for use on seasonal mail such as Christmas cards. Many countries of the world issue such stamps who are regular postage stamps, unlike Christmas seals, and are usually valid for postage year-round (in some countries they have a discounted value and are for use exclusively on Christmas cards). They usually go on sale some time between early October and early December, and are printed in considerable quantities.
History
It is a matter of some debate as to which is the first Christmas stamp. The Canadian map stamp of 1898 bears an inscription "XMAS 1898", but it was actually issued to mark the inauguration of the Imperial Penny Postage rate. The Christmas connection has long been reported to have been the result of quick thinking; William Mulock was proposing that it be issued on 9 November, to "honor the Prince" (meaning the Prince of Wales), but when Queen Victoria asked "what Prince?" in a displeased manner, Mulock realized the danger, and answered "Why, madam, the Prince of Peace."