found: Work cat.: Das Grosse Buch vom Posthorn, c1985.
found: New Grove dictionary of musical instruments, 1984:p. 142 (Post horn (Fr. cornet de poste; Ger. Posthorn; It. cornetta di postiglione). A small brass instrument used in the past by postillions and guards on mail coaches to announce the arrivals and departures and to call attention en route. Although some models were shaped like a trumpet, circular form remained the favourite; from about 1825 post horns were also made with keys to increase their ability to play tunes.)
found: Oxford companion to music, viewed Aug. 12, 2013(Coach-horn see Posthorn)