Over at Colt Forum a bunch of us think this company, Nitex, did the electroless nickel for them circa 1980-82. Some Pythons are lettered with the name Ed House of Nitex. So here's another guy doing this type finish in the 70s. Don't know if my electroless nickel Python was done by him, but check your finish against mine here. But then again, I haven't lettered this one to see if IT'S finish is original.