AM is probably the date code = 1984
Gardone Proof House - to the right of the serial #
FINITO - Finished Proof
PSF - Proofed for Smokeless Powder - "Polvere Sensa Fumo"
Still seeing if I can find others. The one that looks like an F on top of stacked W's is interesting. Is the stamp between the FINITO and PSF say BONOM or WONOB? Can you figure out what's in the one to the right of the boxed AM?