Vintage Zephyr US Military Officers Hat Cap Pin Olive Drab Green Wool Leather.  The inner head band is made of leather and has "This Zephyr you can PAC" stamped in gold lettering.  Very good condition overall.  I'm guessing this is from the late 40's.  Not sure of the size, but I would guess it to be 7-1/4.  Free shipping and same day handling.