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jackgoodmanFirst graded simply means the first specific card graded at that grade by GAI. They may have graded many others at higher or lower grades. In other words, the first t206 Cobb redback they grade at a "5" gets the "first graded" designation. The next T206 Cobb redback graded a "5" doesn't get any special designation.
What were the GAI grades of the cards you broke out of the holders to get regraded?