it just may have the 'early" 22 mag cylinder that has flutes and looks exactly like the 22 LR (ala 1959-60)...you should measure the overall length of the cylinder that is in the gun for a better idea just what you may be looking for, no need to buy a "pig in a poke"................
remember if your gun is higher in number than #150,000 you can use the mag cylinder, as the barrel (bore) diameter is .002 " larger for the magnums, no problems.....if A LOWER NUMBER , SMALLER BORE , MORE PRESSURE !! :wink:
Let us know what measurement you come up with.................should be 1.6xx" something or other.....