Are those stars with a "C" in the middle? or another initial?
The "744" on the butt was placed there after the butt stampings, including the full serial number, were filed off. Notice that the grips overhang the frame bottom indicating that metal was removed from the bottom. The perpetrator, who didn't know the other numbers were assembly numbers, just copied it to the butt for his ready made serial number, since he had removed the military markings to make it appear that the gun wasn't stolen from the Government. And it might not have been stolen, but he didn't know for sure.
What patent dates, if any, are on the barrel top?
The pictures lack detail, but I will try to match characteristics of the gun with details in Bob's book. I may be able to narrow down what it is a bit. For example, it's not an 1889 Navy since it has cylinder stop notches and the added cylinder lock.
Buck