Brewster
Just doing some research on Rolls-Royce Ltd. led me to find out about Brewster, a United States luxury manufacturer which lasted from 1896 until sometime in the 1930s. They were responsible for the coachwork on Rolls-Royce imports beginning in the 1920s but also made their own cars in some small numbers. This, the Brewster Coupe, was powered by a Ford V8.
The company didn't sell enough cars and the increasing influence of the dedicated Rolls-Royce America division led to its demise during the Depression.