Welcome! A very interesting item to collect. I collect a lot of autographs, but haven't specialized in a particular area of autograph collecting. On occasion I run across groupings of autographs that contain autographed GPCs, most are dated, and some are not with only the postage visible. I have between 50-100 or so autographed GPCs with cancellation dates. I always find those the most interesting because I can date the autograph to a period in time.
Good luck with the chase!
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