New Reproduction Cap, Hot Weather OG-106. Vietnam war type cap worn by the Army and Air Force. A baseball-style cap made of dyed olive green shade 106 polyester and rayon gabardine cloth. These are very nice reproductions of the classic "Baseball" cap that was issued to soldiers starting in 1962. Impossible to find originals in larger sizes. They are the same type issued during the Vietnam war until replaced with the OG-507 Cap around 1970. 50% Polyester 50% Cotton in NEW Condition! Three Sizes available: 7-1/8 (57), 7-1/4 (58) and 7-3/8 (59). Sizing lables are off, but we will send the correct size as ordered.