Original issue, US Army Training Circular, 155 pages, size is 7" x 5", bound, dated 19 September 1984.  This is not a commercial copy or print but an original issue government print issued in 1984 and republished in 1987.  This publication is titled - TC 23-65-1, Browning Machine Gun, Caliber .50, Heavy Barrel, M2.  Circular is designed to provide information and instructions for the operation, field stripping, ammunition and marksmanship training of the M2.  Very well illustrated using clear and detailed line drawings.