Well all I know is the coachbuilder is French, from the Valence region.
So far nothing else is known about the car - what chassis number it is, if it survives or who built it. Ed Nankervell, who has spent nearly 40 years researching the history of the special-bodied Jupiters, has drawn a total blank, but it'd be nice to think someone here might be able to come up with a lead!