sentences:  In the early summer of 1924, the USAAS tested a prototype unofficially designated TW-8 and placed an order for 50 examples of the Consolidated Model 1 production variant for service with the designation PT-1.Early production models had flat dorsal turtledecks, soon replaced by a faired version, and some of the first ones were likely built at the Gallaudet plant in Norwich before production began at Buffalo.The first 171 of the 221 produced used a streamlined nose radiator, the remainder used the unfaired installation.