Heavy polishing? I would say someone used a grinder. If you mean separation of the letters in LIBERTY? They are normal. Spend a little more time composing your comments so we can understand what you are attempting to convey. Welcome to CT.
I agree with all of this. Your coin is just a regular, worn half dollar, that is worth its face value. The cowlick has just been withered away, no errors here.
I think your coin has this type of error. The bridge of nose is also indistinct in your photo. The die wear is from cleaning and abrading, not from polishing. http://www.error-ref.com/design-devouring-die-wear/
Thanks for your input alurid. Much appreciated. Im trying to understand. Hopefully i will soon lol new hobby