Baseball card collecting has a long history, and plenty of fans have signed bats, balls and jerseys. But how is an MRI considered baseball memorabilia? When it’s Tommy John’s MRI.

The pitcher, as famous today for the surgery that bears his name as he is for his accomplishments on the field, is selling prints of MRI scans taken of his elbow before the landmark surgery in 1974. Proceeds will be given to charity.

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