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About: Private overprint     Goto   Sponge   NotDistinct   Permalink

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In philately, private overprints or commercial overprints are overprints applied to postage stamps, postal stationery or revenue stamps by anyone other than the official stamp-issuing entity. These overprints have principally been used as a security measure, however, propaganda and commemorative examples are also known. When overprinted for security purposes, they serve a similar function to perfins. It is important to distinguish between private overprints and private cancellations.