High Quality Content by WIKIPEDIA articles! Private overprints, in philately, are overprints (pictures, text, or a combination of the two), usually rubberstamped though occasionally applied by some other method, to postage stamps (or, occasionally, postal stationery) used by some person or entity other than a government or other official stamp-issuing entity. It is important to distinguish between privately overprinted stamps and postal stationery thus intended, and attempts to counterfeit official overprints; it is also important to distinguish between private overprints and private cancellations. Private overprints have been used for a number of reasons. Generally they cannot be used as control marks, as the stamp or stamps are thus rendered invalid for prepayment of postage (though some such invalid stamps have successfully passed through the mails, presumably due to an oversight of postal employees).

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