Italian Proof date codes

[14NYSM]

Italy has a long history of gunmaking and the government regulates proof testing of firearms. If you have an Italian made replica pistol or rifle, you have seen the Italian govt. proof house acceptance marks. You may have wondered about the two-letter code stamped on the frame and barrel.
I found this chart about ten years ago when Cowboy action shooting was popular and shooters resaerched their arms. Enjoy!