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 Mini Yount RC Blank Back 2 Attachment(s) So I stumbled upon a card recently in my collection (pics attached) of a mini Yount RC in pretty good condition with a completely blank back. Does anyone know what this is?  How would you even try to value it?  Thanks!  Bob | 
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 And it's the rare inverted one! Seriously though, there are some people who like blank backs, and being a big rookie helps, but they're basically considered a print flaw and not an error. | 
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 Agree with Scott. The exception would be a blank back proof card, but unless it is a different front from the issued card or labeled from Topps vault it is usually impossible to differentiate a proof card from a blank back error.  But there are a lot of ardent master 75 Mini collectors who might be interested. There is a long thread in the Registry forum on CU with a lot of 75 Mini followers. You might post about it there too | 
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 A print error.  But a HOF RC print error has its market.  Just don't expect RC pricing.  I think I paid under $20 for this one: https://photos.imageevent.com/exhibi...t%20miscut.jpg | 
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 If you’re a Yount collector I’m sure you’d be very interested in the blank back (especially the rookie card).  Also, as stated previously there’s quite a few ‘75 mini collectors that would likely be interested as well. Very unique card... | 
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 Thanks everyone that is really helpful!  Bob | 
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 I’d be interested in that Yount if you ever want to sell it. | 
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