That looks like a Stevens 35. I used to own a papered AOW one in .410.
FWIW, that flare at the bottom of the grips looks nice but SUCKS when shooting. It always dug into my hand during recoil and really made the gun unpleasant to fire. I sold it off not long after bringing it in. (I was a SOT at the time, so a F3 was easy.) I agree with others here that it's a converted gun. This isn't uncommon because most original guns weren't papered. The solutions are to either:
a. Remove the barrel and find someone else with the same problem, trade barrels to get a different S/N, and repaper OR sell the barrel and just find another with a different S/N and repaper;
b. Make the original barrel into a rifled bore;
c. Rebarrel to some other caliber with a rifled bore.
Depending on the new caliber and/or your hand size, that flare may not bother you. My hands are large enough that the Deagle, MK23, and G20/21 seem comfortable.
That wood foregrip is also an addition.