I took the 'ramrod' off my gun ... under the 'ram' I found the numbers 'XXX', which means that I guess that barrel was made for the pistol ... it is the last three numbers in the serial #...
And, not on the underside of the gun, but the bottom angle of the octagon, is the markings SM BLACK POWDER .44CAL ** MADE IN ITALY
So, unless the SM stands for San Marcos (as in ARMI San Marcos), I still own the 'Gun with No Name' ...