I am far from an expert on FDC's, so take this with a grain or two of salt.
The only way I can see this as being legit is if someone had a blank envelope signed which then became an FDC. I don't think that is how FDC's work, though I could be wrong. I have always thought that FDC's were produced by the Post Office, and thus you couldn't hand them an item and ask that it be made into an FDC.
I am also not much to know golf autographs, but it doesn't seem to me that someone would fake an autograph of a rather obscure golfer who won one major.
Strange piece to be sure. I would be very wary personally.
Tom C
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