It took some time, but here's a '25 McFarlan that lives at the Indy Speedway Museum, the Model Twin Valve-6 Model 142 on a 140" whb ($5,400 fob, and beautiful!). Add disc wheels, take away the extra stuff the larger car would have and you have a McFarlan Single Valve-6 Model 42. (Forget things like bumpers and wheels; I have magazines full of ads for disc wheels and bumpers that anyone could add at any time to their car).
Even if the car in question is the bigger McFarlan, I'm convinced that's the marque, circa 1925.
Thanks 1937hd45 for setting the course...
Link to the French website the image came from.
TG