In my opinion, this could be quite possible. I know that Gateway would get signatures on their envelopes before they got the postmarks. They did that with a few (the one example I can think of is when they got Joe Wood to sign their Indians 1920 WS commemorative envelopes several months before he died in 1985). I also remember they did that with Ginger Rogers FDCs where she signed the envelopes before the postmarks and died in the interim.
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