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Old 06-07-2018, 10:46 AM
SetBuilder SetBuilder is offline
Manny
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Join Date: Apr 2012
Location: Key Biscayne, FL
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The term is philatelic cover. See this wikipedia page for more details about what Steve just explained.

Maybe it was just an opportunistic find in a large lot of stamp covers, where the forger chose to add the signature to "complete" the piece.
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