The coach that belonged to the first President of the United States, George Washington. A coach was originally a large, usually closed, four-wheeled carriage with two or more horses harnessed as a team, controlled by a coachman and/or one or more postilions. It had doors in the sides, with generally a front and a back seat inside and, for the driver, a small, usually elevated seat in front called a box, box seat or coach box.
Benson John Lossing, ed. Harper's Encyclopedia of United States History (vol. 10) (New York, NY: Harper and Brothers, 1912)