And the point goes to Wendax, who finished providing all the information I have on this car.
The puzzle car is a 1908 Rolls-Royce 40/50HP. The coupe body was previously on a Minerva chassis from before 1915. From the style of the coupe body, it may be newer than the Minerva chassis.
The two images of this body which I have, came out of the Edwardian Rolls-Royce book. I don't have that book, I found these images online, and can no longer find my source.
Here is the body on the Minerva chassis: