Hi. I have a 1939 Penny with the word "AMERICA" all slid down on the coin. Could this be a Mint error?
Looks like damage. The rim appears to show some damage in the same area of the burnished material. Interesting illusion, but not a mint error.
Naw. It would have been nice and shiny 85 years ago when minted. Those stains, while cool looking, happened much later. Z