Mercer was an American automobile manufacturer before World War II.
There was considerable talent & backing for the Mercer Automobile Company; Ferdinand Roebling, son of John A Roebling, was the president, and his nephew Washington Roebling was the general manager. The Roeblings had extensive success with wire rope manufacturing and suspension bridge design; engineering was not a recent concept for them. The secretary-treasurer was John L. Kuser, who, with his brothers Frederick and Anthony, had amassed a fortune from banking, bottling and brewing.
Washington Roebling was friends with William Walter, who had been making a small number of high-quality automobiles in New York City. The Kusers owned a vacant brewery in Hamilton, New Jersey, and brought Walter and his car factory there in 1906. However, Walter found himself deeply in debt by 1909, so the Roeblings and Kusers bought him out in a foreclosure sale. They changed the company name to Mercer, named after Mercer County, New Jersey. Talented designers and race drivers contributed to the new effort, and the focus became proving their product in competition.

roadster 2 doors / 2 seats, petrol (gasoline) 4 cylinder straight (inline), 8 valves side valve (flathead, L-block, L-head), 4887 cm3, 53.7 kW, manual 4 speed, rear wheel drive

roadster door / 2 seats, petrol (gasoline) 4 cylinder straight (inline), 8 valves side valve (flathead, L-block, L-head), 4929 cm3, 43.3 kW, manual 4 speed, rear wheel drive