PNC isn't a grade. PNC is a grading service.
Professional Coin Grading Service was created in 1986.
For an informal grading, bring it to a coin dealer for an on-site appraisal. For an official grading, it needs to be sent into a professional grading service.
yes
"PL" in coin grading means "prooflike". It is used to describe a coin that has mirror fields and fine details resembling a proof struck coin but is not a true proof.
Many coin shops can submit coins for grading. Also if you are a member of a grading service you may be able to submit them yourself.
Proof
For an informal grading, bring it to a coin dealer for an on-site appraisal. For an official grading, it needs to be sent into a professional grading service.
Send it in to a coin grading service like PCGS.
Mint status
Lots of wear on the coin and the lowest grading possible.
No. They are not a fake coin grading entity, but the quality of the grade will not be as reliable as NGC or PCGS. Any individual grade may be spot on, but then again it may be 2 grades too high.