There is 2 Clementi & Co. original bassoons in the Hichwa-Rachor database. The firm was established in 1802 by the composer and pianist Muzio Clementi (1752-1832) and continued until 1831. The firm is especially known for its pianos. There was a disastrous fire at the Clementi factory in March 1807. This was significant since every worker in the factory owned their own instrument making tools which were lost in the fire. Each worker’s tools were equivalent to roughly the annual salary of a skilled journeyman at the time (£30-40).
Jansen, Will. The Bassoon: Its History, Construction, Makers, Players and Music. Frits Knuf, 1978 Vol. 1, p. 349.
Vannes, René. Dictionnaire Universel des Luthiers. Bruxelles, 1951, p. 64.
Waterhouse, William. The New Langwill Index. London: Tony Bingham, 1993.
Werr, Sebastian. Geschichte des Fagotts. Wißner-Verlag, 2011, pp. 128, 129.