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Posted By: davidcycleback

James Spence Authentication, Simon, PSA/DNA and Global Authentication (GAI) are all respected places.

If it's a large group lot, you might consider consigning it to, say, MastroNet. They hire outside authenticators to authenticate the lots, so you wouldn't have to do that stuff. Also MastroNet gets good prices for autographs. Williams, Mantle, Maris, Dimaggio are all hot stuff these days-- and a nice group lot will likely sell well on MastroNet.

Otherwise, the authentictors are equipped to authenticate a large collection. Visit their websites.