<p>Baseballs signed by entire teams -- and, subsequently, authenticated -- count as some of the coolest collectibles out there. John Mitnick -- who literally wrote the book on the topic --  schools us on the whos, whats, whens, and whys of these rare, beloved gems.</p>

Baseballs signed by entire teams -- and, subsequently, authenticated -- count as some of the coolest collectibles out there. John Mitnick -- who literally wrote the book on the topic -- schools us on the whos, whats, whens, and whys of these rare, beloved gems.

<p>Baseballs signed by entire teams -- and, subsequently, authenticated -- count as some of the coolest collectibles out there. John Mitnick -- who literally wrote the book on the topic --&nbsp; schools us on the whos, whats, whens, and whys of these rare, beloved gems.</p>

Ballin' Out with John Mitnick, author of "Team Baseballs: Artifacts of the Game" - Collectable Daily, May 18, 2022

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Ballin' Out with John Mitnick, author of "Team Baseballs: Artifacts of the Game" - Collectable Daily, May 18, 2022

Ballin' Out with John Mitnick, author of "Team Baseballs: Artifacts of the Game" - Collectable Daily, May 18, 2022