As to the signature...
I spent some time attempting to sharpen and enhance the signature area. Even the reverse color attempt didn't work out as well as I'd hoped. In any case there are at least two details of the signature consistent with the signature area on my Morrison...
1. On neither rifle are the initials deeply imbedded. For many years I thought my rifle to be unsigned. Only when held in the proper light is it possible to see the signature. The light engraving is common on both pieces.
2. Note the location of the * (star) on this rifle. While I refuse to remove the patina from my rifle, the general spacing of the initials around it is similar to what can be seen on mine.
I agree that we can make a reasonable argument against Morrison based on what we think we see or can't see on this particular rifle. Too many other details, though, say Morrison in my opinion. Hammers, locks, patchbox, inlays, etc. all point toward Sam.
And so on this rifle I'll tend to respectfully disagree with Jeff. And while I may disagree on this one, Jeff is responsible for finally identifying what many though to be a Joe Long rifle and properly crediting it to the hand of Joe Schaefer. In other words I'd be the last to discount Jeff's opinion.
Sometimes in this game, unless the rifle carries the verified DNA of the maker, we so-called "experts" may be positive of the identification... And be dead wrong. Obviously I exaggerate but we all need to remember that these makers didn't exist in a vacuum. Many were virtually next door neighbors.
We need to remember that a distance of ten miles was nothing in their day. Consider the young man from the Williamsport, PA area who walked to Pittsburgh in order to purchase a gun barrel. Apparently not all that big of a deal. Time and distance weren't measured by today's standards. At the very minimum one maker was influenced by another and in many cases they sold, traded, or borrowed from each other.
No matter though. What we're seeing is a remarkable example of a unique survivor. Given its condition and obvious signs of a long hard life, what were the chances that gun could ever have been expected to exist in the year 2013?