US Naval Observatory Hat *VERY RARE* This unique hat was purchased the one weekend in 2009/10 when the observatory was open to the public. This was the only run of hats produced, and the observatory has now been completely closed to the public for years. This makes the hat an extremely rare and valuable piece of Naval, national security and scientific memorabilia. The USNO contains one the worlds strongest telescopes, as well as the central clock used by the entire American military, as well as all GPS systems. Perfect condition. Adjustable SnapBack. Embroidered front and brim. Sweatband liner inside. Made in USA.