A friend picked this up at a garage sale. There is no writing of any kind on the gun that we can see. Bore is rusty and rifling is just barely visible( he has not done any cleaning yet). After brushing out the end of the barrel with a .22 cal. brush I was able to insert a .284 pin gauge into the barrel, a .285 would not go. I tried to pin gauge the chamber but the hammer got in the way. Firing pin location indicates a rimfire. Checkering appears well done and butt plate seems somewhat decorative as is the trigger guard. Any ideas gents?