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MillerhouseLeon is absolutely correct. These are in no way proofs. Given the many different places they've been found, they are clearly an insert issue of some sort making use of the Colgan's portraits. As for Henley, he has been known in the hobby for a number of years. Why SCD has never gotten around to listing him is a mystery. My recollection, though I'm currently without my copy to check my memory, is that Egan's old E-card guide (from the late '60s/early '70s) listed him with the set. Anyone have a copy of Egan handy to check?
Dan