 Complete the following phrase:  The PVT prototype probably first flew in 1934. An initial production batch of 20 aircraft was delivered to the YAF during 1936. Another 40 were delivered during 19381939, of which the last 10 had fixed 7.7 mm 0.303 in forward-firing machine guns fitted and were powered by a licence-built version of the Gnôme-Rhône 7K engine, the IAM K7. More PVTs were under construction at the time of the 