No doubling to be found here. In 1966 all coins were minted without a mint mark from all producing mints in order to prevent hoarding of coins during that time.
I agree, no issues on this coin. Your photo blow up is interesting but please in the future just let us see the whole coin without enchantments. This quarter is a well worn example.
Keep in mind these went through a lot of vending machined that flatten the surface on scrape at a time. (That is how the meck tells if it is real or not.) Altering the devices on the coin each time it does through. Thus they are not a doubled die, just a worn coin.
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