Many years ago I got in a gun trade a short rifle in .22 rimfire caliber. It is a rolling block action, a very short gun, I think they called them boys rifles, or parlor guns back then. Anyhow it has this on it:-bottom tang has R O 857, upper left side of receiver has PALMETTO. Under side of receiver has a takedown screw, with a ring through it. It has crude open sights, a simple leaf notch rear, drift adjustable, and a small post front, drift adjustable. Appears to have walnut stock. The forend is held on by a screw going through mounted to a barrel stud. This rifle still shoots. Any of you have an idea when and where it was made? Thanks.