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Posted By: davidcycleback

I hadn't heard of Mack ever using an autopen. Autopens are rare in baseball, but are common with politicians. Beyond forgeries, the only thing you really have to worry about for baseball folks are stamped signature (easy to id, as they look like stamps not real writing) and secretarial signatures (again, won't look like the real sig). Of course, many baseball items have pre-printed signatures, but most realize that their 1971 Topps card wasn't actually autographed.