I have a few "early" Clear window PT-19s, with painted pilots. One is a very rare Kenbrite, made in Australia. Apparently, Cox made a deal with Kenbrite toys of Australia and sent them molds. The blue and yellow are slightly different shades, and Cox sent the engine assembly with wheels, bolted to the firewall, along with the boxes to Kenbrite. I think the earlier PT-19 had a more forward CG due to the weight of the metal fuel tank.