They look like the optional (I think) AL wheels for a Spitfire. Just saw a set a month ago on a Spitfire I looked at here in town. No clue on the offset.
They look thick, I'd guess 3.75 or maybe 4" of backspacing. Anyone know enough french to ask?
I've seen similiar wheels on Mailbus, Novas and others, but only in old pictures...