SIMPLE ANSWER:
Circulated coins are graded by how much wear the coin shows.
Mint State coins are graded by how well the coin is stuck.
A Proof coin is a particular issue of a coin not a grade of condition.
The grade of a circulated coin is based oc how much wear it has.
PF-69 is not a value, it's a grade. But it does affect the value, the higher the grade the more value a coin has. A PF-69 coin is one grade below a "Perfect" proof coin.
radiator
its heat
The year of any coin does not determine the grade that's judged by how much wear the coin has.
A Very Fine coin of which the grade is 20. When you grade coins the number system goes from 1-70.
The value of your coin is dependent on the grade of the coin. In 1856 the mint produced a seated liberty dollar and it is valued at between $400.00 and $38,500.00 depending on the grade of the coin.
water boiling in a pot
That grade is a very low grade for a coin. Coins are graded on a scale of 1 to seventy with good being 4. It is almost the worst condition a coin can be in.
PNC isn't a grade. PNC is a grading service.
To get that specific of a grade on a coin, it would need to be professionally graded though a service like PGCS, though a coin dealer in a shop could give an approximate grade.