Adolphe Sax (flourished 1843–1894)
Valve Trombone, ca. 1862
Brass; maximum overall height, assembled: 750mm; maximum overall width assembled: 680mm; maximum overall depth, assembled: 213mm
The Metropolitan Museum of Art, New York, (TR.217a–d.2014)
http://www.metmuseum.org/Collections/search-the-collections/652387