You find a coin you wish to get grated. But your not sure what to get minted for. " mint error" or " variety error"?? It is on the variety list but only for the Obverse side of it. (NOT) the reverse side of that coin. 1972 D half dollar. 2017 D penny with a "strike through" "machine error" . (In God we trust) the "IN" has a 90 degree (G) counter clockwise on the up leg like a devil tail to the naked eye. A j with a mag. A 2020 D SOMOA quarter with the lettering stretched like 3D bubble shadow. The one with the mother and son bats. So what is it? Is it a mint error or variety error. There clearly new discoveries. I found as the covid-19 started. Getting pretty good at it too.