If it was struck over a dime, why is it on a copper planchet? Google overstruck errors (or check error-ref.com) and see how the under type looks. Can you see some recognizable design elements? Can you see any on your coin? Maybe it's just damage?
Just a common date copper cent that has some damage. When you see something strange in a coin ask yourself how that could have happened in the minting process. Hopefully you understand how t coins are minted. If not there are videos on the mints web site to help.
ask yourself why you think it's a dime. ask yourself what is the difference between a 1941 cent 95% Copper - 5% Tin and Zinc planchet normal strike Diameter: 19 mm Weight: 3.11 grams (without circulation wear) and a 1941 dime 90% silver and 10% copper planchet normal strike Diameter: 17.9 mm Weight: 2.5 grams and how can you determine that ?? what can you compare, weigh ?? and don't forget the coin in your hand is 81 years old. How would your car be if it was 81 years old and you couldn't replace anything on it? 81 years of circulation wear. If people dropping it on the sidewalk, putting it in machines, pockets rubbing against other change, dinosaurs eating and pooping it out, etc.
