Bicentennial Proof Set Moon Error on half dollar reverse of Independence Hall

The set I have is the three %40 silver Clad Coins from the San Francisco mint and the coins are still in the cases from the mint. I see that the errors on these sets go for maybe $100 - $200 but the one I own is different because the mistake looks like a moon in the sky(under the D in United) and that it actually looks like it was a design they used, which I know that was not in the design. I am taking economics in college so I know how the supply and demand work. I have seen coins go for $1,000s at auction when someone told them they would not get more than $30 for it. So someone with money may want to make a set of errors that do not look like errors. I just started with examining coins closely but I would like someone who has a set, sound, knowledge base on these types of coins to tell me more about mistakes like these. It would be very appreciated.

 

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huh?

 

Looks like a strike-through ...

 

Does a Strike Through lead to a demand for coins that are still in the plastic holder from the mint, with this error?

 

No..not really. It's common and not really a major mint error.. If it is actually a Strike Through issue.

 

I wold lean towards a strike through also. Very neat on a proof coin!