WWII US Marine Corps Prisoner Marked HBT Boonie Cap. Standard issue od hbt hat, with the multi-stitched brim. On each side of the brom is stencilled a black circle. This is a marking you see on WWII Marine Corps Brig uniforms. Hat is very well worn and used. There are some penned in markings on back inside brim but can't make them oout. Small size.