Did you read this thread? If it is a circulated coin just spend it, there is no collector value.
Someone just stamped it, nothing like that could happen at the mint.
Sure post some pictures, we should be able to help.
I think you will have to be more specific about what kind of expert looked at the coin, and what did he or she do to come to this conclusion....
Looks like a normal quarter with 35 years worth of wear and abuse.
No cents in 1966 had a mint mark, so that is normal. Weak letters on the reverse is nothing special either. Could be 52 years of wear, or they...
Nah, that is just badly damaged.
That is what a nice circulated war nickel is supposed to look like. 73 years of patina!
Not a real quarter, note on the obverse it says "close quarters".
Separate names with a comma.
