5.5x11.25" cap flattened as originally produced and distributed. Cap is garrison style and crown is fine weave starched white mesh. Headband is blue stiff paper repeating yellow arches symbol on each side in addition to a continuous series of smaller white arches. Inside headband has illustrated instruction for adjustment to five sizes between 6-7/8" and 7-3/8". Inner band also has patent number documenting to early 1963. Unused and Mint.