Some thirty examples were built in England, with licences acquired by Focke-Wulf to produce it in Germany (as the C.20) and by Lioré et Olivier in France (as the C.21), although no actual French production took place.
During the early 1930s, the Royal Air Force operated two C.19 Mk IIIs for evaluation of the autogyro concept (serials K1696 and K1948) [REF].