What you have is a "magician's coin," a novelty where two heads have been sandwiched together. I know it's convincing but far likelier than a mint error that's largely undocumented. You could try to get it certified but the grading company is likely to side with me on this one.
📋 Item Submitted
I have this 1966 kennedy 1/2 dollar. That has a major
mis print error! I have searched the internet thoroughly and cannot find another one like it. I think it might be a one of a kind.
The mis print is that it has
double obverse or obverse on both sides and no reverse. No mint mark! Please email me and inform me about my coin.
Thank you!
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics



