That's when the screw holes are no longer 90 degrees to the surface of the metal, as a result of incorrect/overzealous polishing.
That poor pony has just about been polished to oblivion.
IIRC, that barrel length is a lot less common than the 4 and 6 inch barrels.
That would make it more valuable, if original, and more likely to be fraudulently installed by an unscrupulous individual for the purpose of selling the gun for a LOT more than it's really worth.
Myself, I'd rather have a 6 inch Python. I don't plan on CC'ing a valuable work of art.