A postage and revenue stamp, sometimes also called a dual-purpose stamp[1][2] or a compound stamp,[3] is a stamp which is equally valid for use for postage or revenue purposes. They often but not always bore an inscription such as "Postage and Revenue". Dual-purpose stamps were common in the United Kingdom and the British Empire during the 19th and 20th centuries, and they are still used in some countries as of the early 21st century.
Dual-purpose stamps used for postal purposes usually bear a postmark, while those which are used as revenues bear some form of fiscal cancel (such as a pen cancel, a handstamp or a commercial overprint).