Your second photo showing a clearly stamped proof mark looks identical to the proofs on my #2. My marks are deeply stamped and have lost their definition. As for the barrel on my example, I doubt it is Smith & Wesson produced as it looks identical to the Tower of London example shown in Parson's book Smith & Wesson Revolvers (Morrow, 1957) on page 63.
There is a discussion at the bottom of that page that (paraphrased) says that the English made revolvers are cheaper than the American made and that distributor can't compete. S&W responded that they were sending Power of Attorney to seize the copies. A further discussion stated that F. Claudin, S&W Agent in Paris, in order to resist these copies, would mark genuine S&W's with: "Fd. Claudin Brevete a Paris Boulevart des Italiens 38".