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Philately
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aerogramme, aerophilately, black jack, cachet, cancellation, cinderella, albino, album weed, ambulante, aniline ink, authentication mark, back-of-book and 104 more...
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reesetee A mark (such as initials) placed on the reverse of a stamp that has been examined and certified to be genuine by an expert. Such markings do not detract from the value of the stamps when they represent the endorsement of recognized authorities. Aug 24, 2008