http://www.ebay.com/itm/272104246504

This vintage cowboy hat was made in the 1920s by the John B. Stetson Company of Philadelphia, PA from Clear Nutria felt. Interestingly for such a huge western style, it was sold by John S. Harman & Son, Hatters, 87 New Bond Street, London.  The felt is amazingly pliable, with a high crown, a curled brim edge and a thin ribbon.  The lining is green, and the sweatband is textured brown leather, both bear a very detailed Stetson stamp. The lot no on the back of the sweatband, 5157, helps to date the hat.  The brim measures 4-1/4″, the crown measures 6-1/4″.