While some brass pulls may have been original to a powder horn here or there, I am always a bit skeptical, and think many that we see were later additions, at times during the working life of the horn, but unfortunately many were added in the 20th century since it was a quick, easy repair to get an otherwise good horn back to looking whole again. Another consideration is that some of the more common pulls found on horns, like a perforated brass post with moveable brass ring, appear a little older than the horn itself, as if salvaged and repurposed on the horn. I've seen several Tansel horns like this, mostly earlier KY era horns but also a couple later IN era horns, none of which I believe were/are the original front strap attachment for the horn... although some show good wear and were on the horn for a portion of its working life. And some brass pulls were added during the Victorian age when many old heirloom objects were "cleaned up" to look better. A good question is, when you look at the finer early horns that have not been tampered with, how many have brass pulls? And if those better horn-makers didn't use brass pulls, why would the more common horn-makers use a more expensive pull than the best horn makers?
Shelby Gallien