Antique US Navy Officer’s Bicorn Hat 1898. Oh, remarkable antique hat. This is a US navy officers hat. It’s a trap bicorn hat, and on the inside it says midshipmen’s store. It is worn a little bit, but in amazing shape. I’ve taken a close-up of some of the stitching, which is wonderfully perfect. It measures at: 18 inches wide, 7 inches deep and 6 inches tall.