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Jimmy LeidermanDavid is correct, but college game trophy balls always attract non-baseball college memorabilia collectors driving the prices up.
A similar situation occurs with early college baseball photographs and scorecards.
Trophy balls from the 1900's are rarely seen, but that doesn't mean a higher price tag.
Expect a little over $1K for a "common" trophy ball, and well over 5K for a well known team ball.
Another thing that can change the price tag is the trophy ball design. (Paint color, a silver tag, visible stats or names, etc.)