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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

‘authentication mark’ has been looked up 237 times, added to 1 list, commented on 1 time, and is not a valid Scrabble word.