There is 1 original HKI.C.W. bassoon in the Hichwa-Rachor database. Nothing is known about this maker. This bassoon and an oboe are the only instruments with this stamp.
Literature: Dart, Mathew. The Baroque Bassoon: form, construction, acoustics, and playing qualities. PhD thesis, London Metropolitan University, 2011. pp. 89-92.
Young, Phillip. Loan Exhibition of Historic Double Reed Instruments. August 1988.