I have a 1981 us penny with no back designs or mint mark on front. The back never got filled with copper. If you look at the back with a magnifying glass you can see dozens of circular lines leading to the center getting smaller and smaller ..Got in regular circulation a few months ago and wouldnt have even noticed if when i was taking my change out of my wallet that it sounded like a Canadian cent. Been looking for almost 2 months to find a match and price to this but there is nothing out there that comes close to a penny missing the entire back side and not being filled in. I also know there is no point of counterfitting the lowest denomination of American currency.
Welcome to CT. You'll need to post photos of both sides to full image in order to get the information you're asking. We can only speculate without photos and that's not good.
I have a 1981 us penny with no back designs or mint mark on front. The back never got filled with copper. If you look at the back with a magnifying glass you can see dozens of circular lines leading to the center getting smaller and smaller ..Got in regular circulation a few months ago and wouldnt have even noticed if when i was taking my change out of my wallet that it sounded like a Canadian cent. Been looking for almost 2 months to find a match and price to this but there is nothing out there that comes close to a penny missing the entire back side and not being filled in. I also know there is no point of counterfitting the lowest denomination of American currency.
When a Cent is made it starts off as a blank planchet. Two Dies strike the blank and form the design using tons of pressure. Copper is not added to the blank. Your Cent started off as a normal struck cent. Then somone deliberately damaged it by somehow removing the back. The circular lines you see is evidence of a grinder. The no mint mark means it was minted at the Philadelphia Mint. That has nothing to do with the damage to the Cent. There is no premium for your damaged Cent
From the description it sounds like half of a magicians coin where the one side has been hollowed out to fit a cut down dime.