If you hadn't been there and picked-up that old horn, there's no tell'n what it's future might have been in the hands of, dare I say it (Dare, Dare!)... an interior decorator. It could have even ended up in a photo in Ladies Home Journal - perish the thought!
You know, if I were a frugal man with aging eyes and I'd put my powder horn down on the ground and lost it because it blended in, I just might do something to help me keep track of its replacement.
Neat old horn with or without the paint.