My advice is probably only worth what you are paying for it lol, but I would think that if you are just going for one card that either a 1951 bowman Mantle or a 1933 Goudey Ruth are good options. I even like the World Wide Gum Ruth's, as I believe they are still a little under appreciated compared to their Goudey counterparts. You said you were open to other sports and while not as expensive as the others a high grade centered 1958 Jim Brown should hold it's value or do better as centered versions of this card are tough to come by. I am of the opinion that vintage football has more room to grow than baseball so high grade centered examples of older football HOF RC's would be worth looking into. Ultimately I would try to find cards that you will enjoy owning no matter what happens to their value and trust that in the future these will be the cards that others see value in too.
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