Vintage Dunlap duplex hat. Era unknown - perhaps WWII or earlier.
Yes Scott... it is the one you sold. More photos and details posted in this thread.
On dating, I seem to remember you thinking the hat as earlier than I believe it is. My guess is somewhere in the range from 1938 and 1945, based on the Sizor patent and on the manufacturing tag, which appears to be a 1940s HCA variant.