This pocket watch made in London, England by H. Batteson, measures about .75″ x 1.75″ and is documented to have been carried throughout the Revolutionary War by the Commander of the New Jersey Militia, Sylvanus Seeley. For source and more details, click here.
Image from: http://www.cr.nps.gov/museum/exhibits/revwar/image_gal/morrimg/pocketwatch.html