I don't know much about value of these, but this one was on eBay for $65 and I got it. That seemed fair to me. Coburn's brother Joe was a significant fighter, a claimant to the Heavyweight title for a time. There's very little about Mike (any other heavyweight champions have a bantamweight sibling that boxed?) out there though, and I'm not finding much. I can't think of another card Mike appeared on.
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