A "British Bull-Dog" killed President Garfield
Fortunately the grips are wooden, and it was clearly not a quality firearm as made by Forehand & Wadsworth of Worcester, Mass (here's one of those).
In fact, the Garfield weapon looks to me like a cheap Belgium gun.
The gun that Hinkley used in his attempt to murder President Reagan was a West German Rohm.
The cheapest and crappiest gun ever made. It was a .22, was sold by Mail Order for about $20 new, and was constructed of Zinc Die Castings, much like the Hubley Car Model Kits of the sixties.
Zinc is great for Model Cars, not so much for a gun.
Teddy Roosevelt was also shot at by a would-be assassin.
I don't know the gun used, but the dent appears to me to be a .32.
Teddy earned his place on Mount Rushmore. He realized America's power, and used it to advance American Interests. He realized the importance of a Canal across Panama, and did what was needed to obtain one. Whether or not other Countries would be "offended" by American Interests did not concern him. He was a great Leader, second only to George Washington: the greatest of all !