Ok, guys... I've spent some more time going over the No4 and have spotted another clue (possibly) to the originality of the butt. The pic in my last post showed a stamping on the left side of the receiver below the wood line. The same stamping (although with a different stamp set) is on the top of the butt's spigot.

Does any one know what "C 28" means in this case....? Has anyone seen this marking, or even another marking in the same location on a No4?

John R, could it be a mark from the system within Canadaicon?