How much is Sammy Sosafirst home run ball worth?

Answer 1

For the Baseball to have any value as the first home run baseball hit by Sammy Sosa, you would need strong provenance showing that the baseball is in fact the home run ball hit by Sosa. A letter from a player, team, or league official would be acceptable. A letter from a fan at the game would hold little weight if any.

When Sammy hit his first home run, he was a rookie, and the baseball would have not been documented as such unless the ball was returned to Sammy Sosa as a keepsake, and then if he decided to give the ball away as a gift or sell it, the chain of custody of the baseball would need to be documented.

If the baseball has no provenance, it would be valued as a used baseball. If the baseball sits in Sammy Sosa's personal collection a value cannot be given as it was never sold at auction.