Doesn't look like a slide switch, but the toggle/pivot lever switch, like on my '86.
There should be stickers on the firewall in the engine bay, and the VIN plate, and stickers on the driver's door frame-posts.
My '86 was made in Brampton, Ontario, Canada for a U.S. model spec that was originally sold in Texas.
I'm guessing that this one was originally sold on a U.S. base in Europe. Check those stickers.
But, somewhere I heard some were sold in Switzerland.
The radio band range was (is?) slightly different in Europe than in the U.S., so it may have been sold with a DIN spec radio before that was standard in North America.
What's with the different rims? And different roof racks? And one has door bump markers and the other doesn't. Different badges on the side.
Are these photos of the one for sale, or of 'similar'?
Where in France? Could be a nice weekend trip, when you're not on call.