Methods of Cancellation
While revenue stamps often resemble postage stamps, they are not normally intended for use on mail and therefore do not receive a postal cancellation. Some countries such as Great Britain have issued stamps valid for both postage and revenue, but this practice is now rare. Many different methods have been used to cancel revenue stamps, including pen cancels, inked handstamps, perforating, embossing, hole punching or simply tearing.
From around 1900, United States revenue stamps were required to be mutilated by cutting, after being affixed to documents, and in addition to being cancelled in ink. A class of office equipment was created to achieve this which became known as "stamp mutilators".
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