Mark McGwire and Wally Berger dual-signed First Day Cover (FDC). This FDC was made to commemorate Mark McGwire's rookie home run record in 1987. It measures 6.5x3.75" and has a postmark date of August 14, 1987, the day that McGwire hit his 39th home run of the season, which broke Wally Berger's record. McGwire and Berger each signed the FDC. The FDC is in near mint condition and has been graded and slabbed by PSA.

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