The top, 1860 model, just looks too good to be true.
And, I note, the serial number is right in the middle of the series of the Colt-Colt reissues of the mid-1970s. I sold some out of my shop and had a personal 1851. The reissues (at least the '51) had squared trigger guards.
Not saying with any authority it isn't original. But, if I had the one hundred bigs to plop down, it would get examined by, at least, three experts first.
Color me skeptical.