A local gunsmith (1950-60s) used to carry a line called Prandelli-Gasperini (spelling??) that was made by V Bernadini. They had pins on the sideplates like this one but were boxlock guns. Check the triggerplate, this is a boxlock, side locks don't have this type.

I learn something every day, and a lot of times it's that what I learned the day before was wrong