Retained cud is sick also with the bi level die crack on reverse as well. Let’s see this turn into full cud on the front and a retained cud on the back only no one. there’s also one on eBay right now with the retained cud in the same spot but heavily greased put on each side of the coin. Don’t believe the two errors r related
Obv looks like it could be a retained cud, reverse looks like a partially separated clad layer. Although it might be a retained cud. Hard to tell from that image.