Many of us are thinking "PR" means Pierino Ruschetta.
I have seen on other Italian forum, Ruschetta made some Shotguns and it's stamped "PR" nearly the "break barrel" (i hope you understand me...).
Then, it's appears evidence that's the Ruschetta Pierino marks.
But, i didn't found any informations about the start date of this firm.
I had search on "earmit", "NCIC" ect...
I just can tell that's the more oldest revolvers i have seen are :
EIE PR 1972
FIE PR 1971
Then, it would be great that someone could find the date of start of this firm to be able to affirm that "PR" mean Pierino Ruschetta.