• Built by: St. Mary’s Machine Co., St. Mary’s, Ohio
• Serial no.: 3704
• Year manufactured: Circa 1913
• Type: Tank-cooled, four-stroke horizontal sideshaft
• Horsepower: 20 at ˜200 rpm
• Bore and stroke: 8-1/2-by-16 inches
• Ignition: Battery and igniter
• Flywheels: 52 inches in diameter, 4 inches wide