A cool old horn

No - not the "toot toot" kind.

At first, one might think this little decorated bull's horn is a powder horn for black powder, but it only opens at the big end, making the process of precisely doling out powder difficult. Plus, it's pretty small. The big end seals with a large cork with leather tassels.

My guess, based on size and functionality, would be this was a drinking cup, most likely from the American western expansion period (c. 1820 - 1890). It was probably used as a handy and portable vessel for bourbon or whiskey.

In that sense, then, perhaps it is the "toot toot" kind!