All I can think of is maybe Cowboy Propaganda recognizes certain guns as icons and the rest as obscure variations?
IMHO it's the cowboy shooters that have brought the 61 Navies etc. back into being. Gun makers like Uberti pay attention to SASS and if they think it's profitable to make a production run they will. Methinks if not for SASS there wouldn't be any 66 Winchesters or 60 Henry's etc. in abundance, maybe none at all. True, SASS members have driven up the price on a lot of models but because of them there's more models to choose from. Even Merwin and Hulbert are back in production and Remington has licensed USFA to remake the 58.