was introduced, a newly developed 4-cylinder engine of 20-hp,with three-speed gearbox and shaft drive. Briefly advertised as the Twentieth Century Hustler, with an aluminum-bodied, five-seat touring car, priced at $2,500 (), Stevens-Duryea enter the luxury car market where they would remain. Frank Duryea developed a multi-disc clutch and built his transmission in-unit with the motor. Using 3-point support for the unit engine and transmission, would be advertised for all future models. Stevens-Duryea Company The model line grew in 1906, adding a $2,400 runabout and a $3,300 limousine. Stevens-Duryea automobile income was now larger than arms production income and J. Stevens Arms and Tool agreed to set-up a new company. Capitalized at $300,000, 3,000 shares were split 2/3 to J. Stevens Arms and Tool and 1/3 to J. Frank Duryea. Irving H. Page of Stevens Arms became President and Treasurer and Frank Duryea, Vice-President and Engineer. For 1906 the new Model S Big Six was introduced with a huge 9.6 liter six-cylinder motor, seven-seat tulipwood and aluminum body, weighing 2,900-lbs (1315-kg) and priced at $5,000, . Introduced at the January 1906 New York Motor Show, it along with Franklin, was one of two six-cylinder American cars shown. National and Frayer-Miller also introduced six-cylinder cars in 1906. Dating their six-cylinder car from 1905 when it was tested, Stevens-Duryea would advertise their cars as the Pioneer Builder of American Sixes. In 1907, the company dropped the Model L and added the Model U, a six-cylinder (Little Six) of 30/35-hp and priced more competitively at $3,500, . The Model U became very popular selling into 1910 when it was replaced with the Model AA (Light Six). The Model R was offered until a new four-cylinder, the 1909 Model X and Model XXX runabout was introduced. The model X was rated at 24-hp with prices starting at $2,750. By 1910, a Model Y 6-40 six-cylinder vehicle replaced the Model S as the largest car. Horsepower ratings changed and the reported horsepower became 54.1. The Model Y formed the basis of Machinery's Reference Guide No. 60 Construction and Manufacture of Automobiles. Remarks in the publication emphasize how the company reached this configuration in the preceding six years. In 1909 Frank Duryea at the age of 40, on doctor's advice, retired from daily work with Stevens-Duryea due to 20 years over-work and job related stress. Will Remington became chief engineer with Frank Duryea consulting. In July 1911,