Carcano,
Can you ID the actual maker of your drilling? I am asking because I have a top lever drilling (also made "for the trade") in 16x16/ 8x57R-360 (rechambered from 65mm to 70mm and reproofed in 1969 in Ulm) that has the same unusual, shaped escutcheon on the right side of the safety. I am wondering if they were both from the same maker.
Mike