Invention horn (Orchestral horn); An inventions horn made by the company Halary in Paris around 1830 in the original wooden box and with 10 brackets (Bb; A; As; G; F; E; Es; D; C; Bb). This instrument was part of the instrument collection of Willem Mengelberg (1871-1951); who was chief conductor of the Concertgebouw Orchestra from 1895 to 1945.; Halary; Paris; c. 1830 - c. 1850; brass (alloy); w 58 cm