I appreciate all of the input. I visited him again today and shared the data provided by everyone. We looked at the gun again and tried to remove the barrel catch screw but didn't want to damage it. I did remove the replacement grips and found the US stamp on the butt and the serial number.

He was quite pleased about the history of the model and to finally learn something about it. He then went to the safe and brought me two percussion black powder long guns and asked me to research them. As I was leaving, he handed me the Schofield and told me to take it since I'm the only one that has ever shown an interest in his old guns.