Alphonse (Antoine) Sax (Belgian, Brussels 1822–1874 Paris)
Cornet-Trompe in D, ca. 1862
Brass; L. perp. to bell 33.9 cm. (without mouthipiece), Diam. of bell 22.5 cm., Diam. of bore 0.274 inside receiver
The Metropolitan Museum of Art, New York, The Crosby Brown Collection of Musical Instruments, 1889 (89.4.1105)
http://www.metmuseum.org/Collections/search-the-collections/501683