Found A Very Interesting Error(S) On A 1966 Quarter With No Mint Mark.

I agree with PMD no errors.
John1

Yes, post-strike hit/ding.

I , I agree PMD

to the CCF!

When you see metal that has been pushed aside from original position then it is likely just damage. Like already said "a hit mark".

to the Community!

the no mint mark is normal for this year and for 1965-1967 as no MM's were added to any coins no matter what mint they came from.

Now your coin - it looks like the rim took some heavy hits, denting it in.

to the CCF!

Usually, a US coin with no mint mark simply means it was struck at the Philadelphia mint. As Dearborn noted, none of the coins minted in the US had mint marks in 1965, 1966 and 1967 as part of the 'Coinage Act of 1965.' This was part of an effort to discourage coin collecting and hoarding enacted by Congress. When the mint went from 90% silver to cupronickel clad, the US experienced a massive coin shortage due to the hoarding and exporting of silver coins.

There was also an effort to outlaw coin collecting. On May 21, 1965, Sen. Alan Bible, D-Nevada, introduced a bill that stated that the export, selling or purchase of coins as activities that would be made illegal with it's passage. True rarities and collectors' items would have been exempt from this.