how do you know that gun is not original?
I have original Galbraith guns in both bronze and steel. There are more differences than I have time to list between either of them and that one. The Galbraith in bronze has been faked for about 25 years in Taiwan, and the little wheels are the first big giveaway, then look down the bore, very crude and rough, never intended for shootiing, plus the "bronze" one is made of the cheapest brass they can find. It is also too light. I can guarantee that one pictured "ain't raht." It appears to be made of ferrous metal. Notice the recent grinding/buffing marks, and lack of patina on the bare metal. Many clues that should be whacking any potential buyer over the head.
I have not looked closely at the pix of the other stuff but it all may be real, but now that we know there's at least one that isn't,
caveat emptor.