Lowball Forensics - can you determine the date/mint for this seated half?

As a lowball collector, one of the "skills" one develops is the ability to guess at severely worn coin dates/mint marks. Below, please find images of a coin I purchased on ebay. It was listed by the seller as an 1864-P Seated Half. See if you can determine the date and from which mint it came from. I was able to guess from these pictures and the coin in-hand verified my guess.

Craig
If I had it my way, stupidity would be painful!
If I had it my way, stupidity would be painful!
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Comments
Positive BST as a seller: Namvet69, Lordmarcovan, Bigjpst, Soldi, mustanggt, CoinHoader, moursund, SufinxHi, al410, JWP
Lafayette Grading Set
bob
<< <i>Yep, 1860-O to me too.
bob >>
The mintmark appears to be an "O".
The 3rd digit of the date looks like a "6".
The only dates struck in New Orleans in the 1860's are 1860 and 1861. Given these constraints, the last digit of the date is a "0".
Therefore, the date/mm is 1860-O.
My Adolph A. Weinman signature

Partagas, I have a slick obverse 53-O that is also identifiable only by the reverse (O mint mark and Rays).
If I had it my way, stupidity would be painful!