This sporty model is from the Mercer Car Company. It had some high powered executives, including members of the Roebling family, famous for the construction of the Brooklyn Bridge.
The description states this model was built with a 30hp engine, while other sources indicate it was 55hp. The car was built as right hand drive with the windshield mounted in a frame on the steering wheel. The car was a very successful racer in its early years, even considering the gas tank was immediately behind the seat backs. The company was closed in 1925.
The postcard itself was used as a marketing reminder by the Gezon Motor Sales in 1957.