The Curtiss Aeroplane and Motor Company produced practically 10s of different types of Hawk aircraft. They were all very similar, and it turns out that the Hawk III I used to visit at the museum in Bangkok is identical to the Hawk II, with the exception of a really odd-looking retractable landing gear. The reason it looks so odd, is now clear to me. They took a Hawk II and made a couple of bolt-on pods that the landing gear could retract into. How much extra speed that gave them is unknown, but at least they had an aircraft with retractable landing gear to export. So, it turns out I have tons of documentation for this aircraft.