The model pictured here is a late one, at least from 1952, because of the thick bootlid.
The first version had no boot at all, it was introduced in 1935.
And then in circa 1947 the latteral flaps on the bonnet were replaced by a grille.

I will research more about these changes and try to correct this page and add these variations as different models when I got time

SolanaBogon wrote
As there are a lot of little variations, i haven't do them (already 13 variations of Traction Avant in WCS). It's also really difficult to have pics for all variants/variations....