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Major League Baseball keeps tabs on game-used items, while collectors work to authenticate pieces from the past.

Prove beyond a reasonable doubt that what you’ve got is an authentic piece of baseball memorabilia and you’ll have no shortage of potential buyers.

Even current game-used items are in demand. That’s why Major League Baseball has its own army of authenticators working every big league game. It’s why proper knowledge and research is so vital when the topic is vintage jerseys, bats or other memorabilia.

CNBC’s Brian Shactman gets up close with the MLB team and with long-time collector Marshall Fogel. Watch his story: