This vintage hat has no maker mark, but I figured it to be from the 50's. It measures 21" in diameter which is the equivalent of 6 7/8. It has a 3.5" brim and a 6" crown. It's a beaver blend with an amazing finish, and in great shape.
This hat reminds me of the hat that Jane Fonda wore in "Comes a Horseman" 1978.