This vintage boater was made in the early 1920s by Knox, and originally sold for $20, making it quite an expensive hat in its time.  It has a light russet brown leather sweatband and a pleated lining.  It is a 7-1/4, with a 5-1/8″ crown and a brim which measures 2″ on the front and back, 1-3/4″ at the curl of the side.