Well I'm not familiar with what the throat is...but the horn is
9 1/8 inch on the outside curve, 7.5 on the inside curve, 2.5
across the base, end of spout is 1/2 inch and hole is just
under 3/8ths. I showed it to 4 horn collectors at the Bedford show
and all of them put it between very late 1700s and 1820ish.