http://www.ebay.com/itm/401054891710

This vintage fedora was custom made in the 1960s from pure beaver felt, and originally sold for fifty dollars, making it extremely expensive at the time.  I have owned many 7X clear beaver Stetsons from this era and the dress weight beaver felt has a very similar feel.  It is a 7-1/4 and has a 2-3/8″ brim and a 5-1/4″ crown.