Tommy F - I can't comment with any confidence. In general, however, all Colt open top .44 Cal revolvers will be on an 1860 Army frame and, when they left Colt, had a SN on the Frame, BS, TG, Cylinder and barrel or barrel lug. Most will also have an assembly or conversion number on the gate, frame and cylinder arbor. Also, all, except the Long cylinder conversion, which has a newly made cylinder and was probably not done by the factory, will have a cylinder scene.
So, if your O T doesn't have any of these numbers it has at best been refinished at least once.