Had to do some digging for the old CP, but it is indeed a near perfect copy of the Skil Model 1120 that snapmom owns. If anyone knows the connection between CP and Skil versions it would be very much appreciated. The CP version was Model CP-723. It was apparently also sold by MAC as the MAC I-1123. The MAC version is just a rebrand of the original Skil 1120/1123
I recall that when I purchased it, one of the air motor backplate screw bosses was damaged, and I found a new one. I did keep the old backplate with all the ID and model number info. As you can see in the pic, the impact was indeed manufactured in Great Britain -- a little hard to read, but it's clearly visible on the bottom of the tag.