Picked this up at an estate auction about 15 years ago in Chester County, PA. It was so dusty when I bought it that I didn't realize it had carving until I wiped it off. Apparently no one else noticed it either since I got it for $10.
The spout has 10 facets filed into it.

The butt plug is flat and shaped to fit the horn, attached by iron nails and has a small iron staple for strap attachment.

In this view you can see a sailing ship, some figures, and some scratching that I can't make out.

Another sailing ship and more scratching.

Bird, another figure and some animals.

Dale H