A friend of mine just bought a 58 NMA from a small local shop, last one they had. The frame has 20 in a box, no other date code. Did the Italian makers go to dates instead of letters for dating. Also on the bottom of the grip is IT 2020 next to the serial number. My old 58 has XX8 corresponding to 1972 for its date code. I'm thinking the newer guns use the actual date of manufacturer. Anybody have a newer one to confirm this?