I had never heard of the .41 caliber Python untill you mention it yesterday Bob. Colt I am sure looked at it and thought about it but according to them one was never built. Now that's not to say some mackine shop or gun smith couldn't have made one up by boring out the cylinder and barrel. That's about the same time that they came out with the Trooper MK III in the J-frame which is a toally different gun. Even different than the old Trooper(pre 1969).