James I am disappointed that you may still be thinking about refinishing your outstanding Python.
But, I will try and help answer your question. I do not believe Colt stamps any indication that it has refinished a Colt. There may have been a time when it did, but I do not believe it does today. Others may know more about Colt's refinishing practices and I hope they join the conversation.
A refinished Python will always and easily be seen as a refinished Python. The refinishing process results in the significant loss of metal on all of the Pythons clean and crisp edges, corners, and roll-marks. The barrel roll-marks, and the side plate pony will forever be thinned and diminished. Some may point out that for an extra charge, Colt will hand engrave those thinned roll-marks and side plate logo, and restore it to a new appearance. I think Colt will indeed take your money for this service, but I have never seen such an enhancement restore the Python to its original appearance. Beyond the roll-marks, the wonderfully polished sharp and clean edges, from the barrel vents to the contours of the frame, will forever be lost and will always appear rounded, over-polished, and yes, refinished. The loss of metal will result in a noticeable gap where the left side-plate and the frame are mated. This loss of metal will also result in what is referred to as a "dishing out" of the surface area where the frame and side plate screw holes are.
Do a simple search in the Forum for "refinished" or "refinishing" and I'll bet you can find photos of these characteristics that I have mentioned.
I hope this helps and I wish you the best of luck, and I hope that your wonderful Python with its valuable and attractive stocks, is never subjected to the destructive forces of a refinish!