http://www.ebay.com/itm/272040489329
This vintage hat was made in the 1950s by the John B. Stetson Company. It is their high end 7X Clear Beaver Quality and has a 3-1/8″ brim. There is no size tag and no reorder tags under the sweatband, but the opening measures 7-3/8″ by 6-1/8″, with a 21-1/2″ circumference.