DIA70xL280mm, Thailand
This is a powder horn, a container for carrying gunpowder. It is made with a a buffalo horn with a nonferrous metal for the base and the spout. Powder horns were very common at a time when muzzle loading guns are used, people would store their black powder for ammunition reloads. As the gun making technology advanced with the same ignition process, the need for carrying the powder horn diminished.
Mountain Folkcraft 