Hey Adam, nice stamps! I have several but they are all baseball. I do believe the sports stamps covered several sport figures, not only baseball.
If you get them graded, I think your only option is SGC. For some reason they only grade the Detroit issues. I sent my baseball Sport Stamps from the Chicago American and they returned them. I sent them to SGC and they graded them - go figure. Here are a couple of samples and they look good in the SGC holders.
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