Hi Runner,
I haved examined many old powder horns over the years while employed by a large museum in the midwest, as well as having the chance to personally own a few original horns that are very old. It's hard to tell from your photo, but the horn looks to be original and of a patten type, that many experts refer to as a "Trade or Indian" horn. As you might already know, your bottom horn follows a common style noted thu the Civil War.
I won't stick my neck out to far from a photo and say that it is an original, but if it were mine. I would just wipe it down with a very light coat of mineral oil and hang it on the wall to enjoy!
I once attended a seminar in Cody, Wyoming a few year's ago titled "Artifacts or Artifakes". This seminar was for museum workers and professionals, to show how to identify original historic artifacts, from fakes. One class example showed us how you can bury a new or fresh cow horn in a barn yard manure pile and leave it there for several months and the matter and ammonia gives off a chemical reaction and greatly artificially ages and makes the horn look decades old. I don't age my horns that way, but I know at least one Horn Maker who goes to this trouble makng his powder horns look old!
Just my opinion...so enjoy your horn!
Best regards,
Rick