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DavidThe autographed Gusti 63 Topps is probably worth a couple of bucks. Card grade and grade/attractiveness of singature is imporant. Most autographed vintage cards are not Near Mint or better, so it does not have to be a high grade card to get best price-- just have a strong overall appearance. Authenticity will naturally be a question in the potential buyer's mind.
Autographed vintage Topps/Bowmans are not widely popular. Most casual collectors would pick an 8x1) or ball. There is, however, a small but avid collecting population who specialize in those. Many of these folks are trying to make sets.