I agree with the Jasco, but I think it's a Thermic "C". There was a vee tail version of that, and I think I have plans for it. In 1939, I don't think the Thermic 50X had been released yet? Like don says I'll have to check the Zaic year books. I love ALL the Jasco and Jetco designs and have a bunch of theme in my collection. Looks like a pretty stiff breeze blowing that day, but everyone seemed to be trimmed out pretty nicely and handling it well.
Type at you later,
Dan McEntee