I think I have 3 different versions of the Cox beaver saws. I also have a couple of IPL/ literature pieces. There is at least one other version that I am missing. I know this because I have a pistol grip with a different pattern in it. This part is the only one I have seen with that pattern.
Here are the three. On the left and middle are 140's. One has the oil/fuel tanks on the left and right and the other has them on the right and left.
The one on the right is labled Beaver.
Here the upper pistol grip is the odd ball that I had mentioned. The lower one is on all the machines I have seen.