I have seen horns in museums, books, and in person with that "shingled" throat feature, (my name for it) that were attributed to NY and New England. So its probably from near where it was found. Some of the ones I've seen were faceted and carved with designs in the borders of the facets. Don't know about a date, but my gut would definitely put it in the 19th century. And my personal guesstimation FWIW, would be 1815 to 1850.