This British hanger sword, measuring around 31″ long, is of the type carried by musicians and non-commissioned officers of the 23rd Regiment of Foot. The 23rd Regiment of Foot was a British unit that saw fighting in nearly every major campain of the Revolutionary War. For source and more details, click here.
Image from: http://www.cr.nps.gov/museum/exhibits/revwar/guco/gucoweapons.html