My 37 terraplane seems to have front window [b]wind deflectors.[/b] They look like your [b]standards vent window[/b] but don't seem to align with the roll up window and seem to be mounted on the out side edge of the window slot. [i] Is this an after market item, or something else? [/i]I am thinking about just removing them.
I think it would help if you posted a picture. Are you referring to breezies?
I think they may be called a Draft deflector.
I'm not the pre-war expert (yet), but I believe you are right, those are aftermarket or possibly dealer items. I've seen similar frames on other marques, but never a terraplane. Someone else will chime in, I'm sure.
I had them on a 36 Terraplane and assumed they were either standard or dealer aftermarket.
Answer to my question, Thanks everyone
This is a wild guess, but based upon this factory photograph, you may have a rare factory accessory for Terraplanes which originally did no have vent windows built in.

Strangely, there seems to have been a separate wing add-on for the Model 71's, which seemed to have some sort of stainless steel wedge above and below it. But perhaps this photo is of a prototype of a concept that was stillborn.

Wow! That's cool. Great find, Jon.
That looks just like them but I don't have the metal part on the bottom.
