The Gloster Nighthawk aka Gloster Mars VI was a continuing development of the ABC Dragonfly powered Nieuport Nighthawk. Gloster took over the design as the Gloster Mars which evolved into the Sparrowhawk. Either powered by Bristol Jupiter or Armstrong Siddeley Jaguar radials, 29 Nighthawk/Mars VIs converted from Nieuports. Jupiter engine in photo. Three of the 29 were sent to Iraq for testing in 1923. This photo is believed to be one of that trio. Photo from: D.W.F Bonham-Carter DFC (via Jim Cownie)