Mercer Automobile Company was founded in 1909 at Trenton, Mercer County, New Jersey by a handful members of the prominent Roebling and Kuser families. Ferdinand Roebling, son of John A. Roebling, famous designer of the Brooklyn Bridge, was the president, and his nephew Washington A. Roebling II was the general manager. The secretary-treasurer was John L. Kuser, who, with his brothers Frederick and Anthony, had amassed a fortune from banking, bottling and brewing. The founders’ focus on the competition resulted in 35R Raceabout racing car. Its inline 4-cylinder T-head engine displaced 293 cubic inches (4,800 cc) and delivered 58 hp at 1700 rpm, in racing trim 85 hp at 2500 rpm. The Mercer Raceabout raced at various AAA events in 1910-1912 seasons. One of the events of the 1910 AAA National Championship was the Kane County Trophy Race held on August 26 at Elgin Road Course near Chicago, Illinois. Two Mercer cars driven by Hughie Hughes and William Barnes finished 1-2.
| Season | Series | Event |
| 1911 | AAA | Kane County Trophy Race, Elgin |
| Driver | No. | Entrant |
| William Barnes | 33 | Mercer Motors |
| Scale | Manufacturer | Collection |
| 1:43 | Brian Phipps | |
| Cat. No. | Quality | Rarity |
| 
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