Here is a bit more info on the design. In 1930, Curtiss began development of a series of monoplane ground-attack aircraft for the U.S. Army, all of which bore the name Shrike at one time or another. Top speed was 247 mph. The bomb load was light, being carried in bombays in the wings, each holding only 200 lbs each. In 1940, the Shrikes were redesignated A-18s and used for training only.
Rod is just really good.
As I noted, Rod Smith correctly identified this very quickly. Chris Bolger also got it the same day it was posted. A number of designs were proposed by various companies, including Parnall. It's design was powered by a 690 hp Pegasus engine, and test flights showed that the design met the requirements of the specifications. However, the project was not continued and was cancelled in favor of the Vickers Wellesley.