The horn's dimensions are not posted, but it looks only moderate in size and simple in construction. Those facts suggest to me that it's a percussion era horn based on size, probably 1840s from its simplicity and not much later since it was decorated. Assuming a New England origin due to the soft wood butt plug, if the horn were earlier, I'd expect a touch more detail on it, such as simple chip carving round the lower edge of the spout tip. The owner was better than average at depicting birds; you can actually get an idea of what he was trying to show on this horn, when on a lot of carved horns, a bird is often a simple generic figure.
Shelby Gallien