A Set of 9 Helmholtz resonators on original mahogany wooden base. The laquered brass (with multiple oxidation spots in the coating) resonators have the K monogram which is the signature of “Rudolph Koenig A Paris”. The inscriptions from the biggest to smallest resonators will be as follow; Ut3 K2 (Koenig) – Sol3 K3 – Ut4 K4 – Mi4 K5 – Sol4 K6 – 7 K7 – Ut5 K8 – Re5 K9 – Mi5 K10. Date will be around 1870.
