They look like BOSCH fender lights from the 1930s. Here is the reference from a French version of the era BOSCH catalog:
So yours would be the first ones listed, part: L 75 S 104 "housing black, border chrome, mat glass".
The title states: "SIDE LANTERNS (Position Lights), with mounting bracket for the front fender of the car, for cars and trucks, 75mm hole size, mounted (held in place) with a nut"
It looks like there might even be a BOSCH logo in the center of the lens on your left light in your first photo?
Hope that helps,
Brad in Maryland