The symbol which looks like the muzzle of a rifled barrel is the Uberti trademark.
AC is the Italian date code for 1977.
PN is for Polvere Nera, literally Black Powder.
Repro of a Colt 1862 Police in apparent excellent condition. I won't guess a dollar value but a new one is $409 retail. It would have been a lot less in 1977.