A mysterious family holiday

Excellent, Ariejan, now I believe we can consider this case as closed

Yes, Michael, I guess we can. The only thing is that I have to correct myself, because the coupé de vile is of course on 507 chassis too, and not 505 (a slip of the finger!).

Thanks, Ariejan, very interesting.
So it appears the early 507 models from 1925 didn't feature the trim alongside the engine hood that is visible on practically all photos of existing Fiat 507s and that there also were versions where the trim was positioned differently like on Piet's photo, right?

It was new to me that Fiat started producing the 507 already in 1925. Is it possible that these early versions looked different than the later ones? I am asking, since on all pictures of Fiat 507s I found on the internet, the engine hood is considerably higher - or put another way: the section above the trim is higher than the one between the trim and the upper ends of the louvres. On the picture of the car in question, however, the two sections appear to have the same size. Maybe you could just provide us a link to a photo of a Fiat 507 with the same features like the one from Piets collection.

I had that thought, too, but the wheels are wrong for any American make.