I have a firearm that was just sent to me to engrave. It is a 1963 Colt SAA in 45LC. I was told that it is in bright stainless. It looks similar to the bright stainless pythons and anacondas. Problem is I have never heard of a Colt SAA in stainless. Is this a brightly polished nickel gun and the high end dealer mistaken? Are there really stainless SAAs with 1960s serial numbers? Is there a way to tell what I'm holding?