Thanks for showing it, Rich! That's a fine old horn! I like everything about it.
I can't comment on a date of manufacture or use, but will defer to the experts. However, I did just recently find an image of a cross just like that carved in a gunstock:
Here is the whole rifle, for comparison:
This is on the
Heritage Auctions website. They describe it as a Civil War era "Austrian musket" (I think a Lorenz) which "found its way into Indian hands." They describe the cross as a "four directions symbol." I'll take their word for it, I guess, although they don't divulge any information regarding provenance or chain of ownership.
I was curious, and looked up more information on cross imagery. A Cross of Loraine is like a typical Christian cross, but with
two horizontal bars which typically, but not always, show the upper horizontal bar shorter than the one below it. A Greek cross is exactly like a "plus" symbol (+), with fours straight arms of equal length. The cross on your horn, and on the Austrian musket, with those flared ends on all four arms, is more like the Cross of the Order of Christ, associated with the Knights Templar:
...although this cross, as shown, generally has an outline in one color, and a central cross in a contrasting color. It is similar in some respects to the Cross of St. John:
...except that the crosses depicted on your horn and on the gun have arms of equal length, and the lower leg of the Cross of St. John is longer than the other three.
So, I don't know what to make of that cross. It may have associations with the Knights Templar, or it might symbolize the four directions or the four "winds," or it might have been just that a country boy in possession of your horn inscribed his initials in the horn, decided he needed to fill the space between them, and put in a cross that he thought looked cool. e also wonder why the initials and cross were scratched onto the underside of the horn, where they don't really show when the horn is suspended.
Who knows? It's fun to speculate. In any event, you have a really nice old horn in great shape. It's a beauty.
Notchy Bob