I can't tell if this is a true reverse clad error or the reverse was sitting in a like of something for a looooong time. Hope these photos are good enough. Would love someone's knowledge who specializes. Lastly, is this worth buying at $20? It definitely has never been cleaned.
Looks like it sat in something. Definitely would NOT buy for $20. @paddyman98 is the resident expert on errors though so I would defer to his superior knowledge.
If you pay $20 for that coin, I've got a bunch in my junk change jar that I'd love to sell to you. Chris
It does not have enough of a Copper color for me to say it is a Missing Clad layer error. It could just be environmental damage just to one side. Here is an example from my collection -