There are several of those 1,850 gold plated Colt Heritage Walkers and F series Walkers on GB. I checked the barrel roll marks carefully against my two Colt-marked civie Walker ASMs, running left to right, cylinder to muzzle. The marks (less the gold plate and Ranger Co. marks) and finish are identical, as are the cylinder roll marks, right down to the differences in the caps of the "Dragoons" vs. original Walkers. And, no they are decidely not Texas Rangers...Ormsby had no idea what Rangers looked like and made the engravings based on Army uniforms of the era coupled with the "Comanche Buffalo Hunt" painting.
Also, with the exception of the ASM cylinder proof mark, the cylinder engravings are identical. The U.S. over 1847 mark on the right side of the barrel lug is identical in size and placement on the Colt product and the ASM, closely following that of the original Walkers, with the top of the 1847 stamping partially obscured by the wedge screw. The Uberti Walkers have the U.S. over 1847 stamped much higher on the barrel lug. I'll try to post pics.
But you know... the real proof in the pudding MIGHT be the rifling differences between the Colt products and the ASMs. I believe the original Colts and 2nd/3rd gens all had gain twist rifling. At least that is the prevailing thought over on the Colt forum, while there are some dissenters. Since I dont own 2nd/3rd gens I cant testify to this myself and to tell you the truth Im not sure I can tell on my ASMs. But what if the ASMs actually have gain twist rifling, too?? Quien sabe? Down the rabbit hole we go...yey again.
I again say, Dr. Davis might have all the right answers. Anyone know how to reach him?