It can't be real. The die would have to have the error on it. It would have been discovered in 1966 and would be a famous variety.
@John Johnson Take a look at this link on how dies are made, from Wexler's website. As you learn the die making process, you'll soon realize why this can't be a mint made error http://doubleddie.com/58201.html
Took all of 5 minutes to create this error! Imagine what a professional could do looking scam someone! I have to agree it's just a well placed circulation hit on the T of OP's coin..