Here is a VERY RARE vintage NOS DeKalb T1100 corn seed farmers cap or hat that is a full mesh top with an adjustable snapback piece on the back. Made in the USA by Swingster of Shawnee Mission, Kansas USA (that is molded into the back of the snapback). Adult size but obviously adjustable.

Here's a quote I read from the Yesterday's Tractor Co. website about the corn seed T-1100: "I remember that DeKalb T1100 being one of the first "super" hybrids around here. It literally took a large market share for many years". 

This vintage hat/cap appears to be New Old Stock. There is a slight bend in the flat bill on the left side. Can't notice it, but I can feel it with my fingers.