Hello. That looks to be some chemical that affected the clad layer a bit. It definitely not missing clad layer unfortunately. Here is an example from my collection of a genuine missing clad layer on a SBA coin. See how the copper color appears. The other side has its normal clad luster.
@Dustin Harper …go to error-ref.com to learn what true errors are. You seem to be posting everything as an error but they are not.
