It appears to be exactly that, a Colt Single Action Army, 4 3/4" barrel, .45 caliber. The serial number should also be on the bottom of the butt. The gun is worn and well used but appears to be in pretty good shape; it may have been subjected to a "restoration" attempt at some point. The holster is old but I can't put an exact age to it.

What else did you want to know?

Jim