a renault reinastella body by weymann in 1930
<< Link Removed>>
Well I think that despite the link being removed there's enough evidence on the internet that you are correct. (Coincidentally it's from a guy who sources his images from the same books as me, but instead places them on ebay and amazon as 'factory photos' to get money from them. A rather unscrupulous way to go about things if you ask me...)
I also found this other rather wonderful drawing which supports the solve, so the point is yours!