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Authentication Question

I wandered over here from the coin forum with a question. I have an Oakland A's team ball that I purchased in 1993 from a shop in Cooperstown. It's got McGwire, Canseco, Dave Parker, Tony La Russa, and others. I'd like to get the ball authenticated. Someone recommended SGC to me, but I visited their web site and only saw cards. Do they authenticate autographed balls, or would PSA be the best way to go. Thanks!

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