The left sides of both barrels are marked with 13, g, a Gardone proof and CL 28. The underside of the lower barrel is marked COLE HARPSWELL, ME MADE IN ITALY. Business environment mba notesĪnd not surprisingly, because when I had a closer look, it was the same model as the trap gun I shoot. One of the guys was shooting a gun that looked vaguely familiar. The left side of the upper barrels chamber is marked Antonio Zoli in gold script. The 20 gauge barrel set is mated with its own forearm which has engraved hardware with the serial number visible on the inside behind the latch. Antonio Zoli Shotgun S Serial Number Visible The underside of the trigger guard is scroll engraved and the removable trigger group has the Zoli bow and arrow trade mark. Antonio Zoli Shotgun S Serial Number Visible.