1979 Susan B proof set w/ error?

hey CT. i came across this today. i'm not sure what it's called but one of the 3 proofs is missing the nickel clad cover on the back. what's this called and does it add value? thanks in advance!

 

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The coin on the right doesn't look like a proof.

Chris

 

Always show both sides of your coins.

 

i misspoke. they aren't proofs. i'll post better pictures later. however, is it odd the have the back portion missing and only showing the copper?

 

It is odd, is it not just toning? You may have to weigh it somehow.

 

OK, here's the update. set includes P, D, and S mint marks. the P is the coin missing the clad back. so, back to the root question... any value added to the coin as is?

 

Look at his other thread over at the Error Coins forum. It is a missing clad layer.

 

That is pretty darned cool. I am not an error expert so I won’t comment on the value. But that is pretty cool.