Ansley Fox was a terrific gun designer and a terrible businessman. After his company went belly up, Savage bought the rights to the name and made these for quite a while. Dunno about when it started or ended.
What I do know is these are tough, durable working class shotguns that will last forever, and they have lots of fans. I had one briefly, and it was an outstanding bird gun. Congrats, and enjoy.
More of these were made with tight chokes than not. My guess, the most likely combo is Modified and Full,second choice,I/C and Mod.Single triggers are relatively rare, most had two.
Early ones had short chambers for the older 2 1/2 or 2 9/16" shells.Like ALL older shotguns, a good smith should look it over before firing, tho that's a little late in your case. The smith can tell you what the choke is, if it's not on the gun. Some of these, including the one I had, had the choke marks underneath, see if there's any markings on the barrels visible when it's apart. Second choice, on the water table, the flat part of the action between the breach and hinge pin.
HTH...