1965 Quarter No Mint Possible Post Mint Damage?

Yep that is all damage. Good job figuring this out @mar.

Also... GENERALLY no mint mark means it was struck in Philadelphia. As the primary mint, they didn't mark their coins until 1980.

HOWEVER -

* The 1979 Susan B. Anthony dollars from Philadelphia were marked.

* Silver War Nickels from all three mints were marked 1942-1945 so they could be easily identified.

* The Philadelphia Mint does not mark cents, except for 2017 to celebrate the 225th anniversary of the Philadelphia Mint.

* The law changing the composition of the minor coins allowed the mint to use all of their facilities without mint marks to speed up the production of the clad (replacement for the silver) coinage. They also did not mark the other coins (1c and 5c).
* The law was changed back in 1968 and mint marks resumed.

The " no mint mark" nonsense on the click-bait YouTube videos refers to a very small number of cases of a small # of coins where the S (San Francisco) mintmark was accidentally left off a couple of dies used to strike PROOF coinage.

(all dies are made in Philadelphia and shipped - unhardened - to the branch mints, where the mintmark is applied and the die hardened for use. This may have changed relatively recently.)

I think that's all the special cases.

Every coin has a "mint", but some coins have no "mint mark".

Yep, just damage. PMD.

to the CCF

Yep - damaged indeed post mint