I am looking at a pedersoli pennsylvania flintlock to find date mark. On the barrel I see the stamps that are required for Italian arms. Then I see '20' in a square. Most of my arms have the date code that we are familiar with through that chart that's made it's way through most forums. I don't see a '20'. Have the Italian manufacturers abandoned the code(s) or is it just pedersoli? I interpret it as made in 2020. My harper ferry flintlock .54 cal pistol has '21' stamped on barrel.