There was an article recently about 'the catch' football - I think it might be the most valuable football that we 'know' exists. In theory, I would say either the first forward pass ball or a ball from the Army-Notre Dame game in 1913 where the forward pass had it's 'coming out' day, Knute Rockne receiving most of the catches.
I don't know about baseball - just too many theoretical balls that would be huge, and I am not sure what really exists.
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$co++ Forre$+
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