Serial numbered cards are base cards, parallels or inserts that have serial numbers on them. This number shows the total print run of the card and the specific number of the card within the print run.
For instance, a serial numbered card might say 26/100, which means it is the 26th of a total of only 100 such cards made. Serial numbers are generally stamped in foil on the back or sometimes the front of a card.
Occasionally, serial numbered are written by hand by the manufacturer. A variant on the serial numbered card is the sequentially numbered card, which lists only a single number, for instance "58" meaning it is the 58th such card made.
Hall of Famer Frank Robinson and Ken Griffey Jr. share the record for most career home runs on the first day of the season, with eight Opening Day homers each.
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