Model Variants (Including Prototypes)
M.1 - Base Series Designation
M.1A - Protoype model with Clerget 9Z rotary engine of 110 horsepower; single example completed.
M.1B - Fitted with Clerget 9Z of 110 horsepower OR Clerget 9B of 130 horsepower OR Admiralty Rotary A.R.1 of 150 horsepower; four examples completed; portside machine gun mounting.
M.1C - Definitive production model; fitted with Le Rhone 9Ja engine of 110 horsepower; 125 examples completed.
M.1D - One-off high-speed testbed and racer from M.1C production stock; fitted with Bristol Lucifer powerplant of 140 horsepower.