Friday’s ad is one of my favorite beer posters of all time, though I’ve never seen it with any text so I don’t know if it was ever actually used as an advertisement at all and, if so, for what brewery. I’ve never seen any information about the artist or even where it’s from precisely, though I suspect it’s French. Still, it’s beautiful.
Looks an awful lot like an Alphonse Mucha piece, but it’s a little less detailed and delicate than most of his posters, and it’s not attached to him on any site. I know I’ve seen it before, though sometimes flipped. I’m curious as to what makes you think it’s French; my guess would have been Czech or German or even Austrian (thanks to the beer), but it could just be Mucha messing with my biases.
Mostly just a wild guess, and the fact that it does resemble Mucha and the art nouveau style (which I can’t help but associate with the French).