Event covers are a type of stamp covers (decorated, stamped and canceled commemorative envelopes) that are created to celebrate an event or note an anniversary. A design (called a "cachet") is generally placed on the left side of the envelope (although there are also "all over" cachets).
Event covers are a type of stamp covers (decorated, stamped and canceled commemorative envelopes) that are created to celebrate an event or note an anniversary. A design (called a "cachet") is generally placed on the left side of the envelope (although there are also "all over" cachets).
Source: Wikipedia "Event cover" · CC BY-SA 4.0
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