The M-17 series of gasmasks were the US military issue gasmask until the current M-40 replaced it in service. Superb mask that was used for decades, and is still a top notch mask. The only reason they were replaces was so that the US could use the same filters as NATO forces. These masks are in superb condition complete with outer lenses, hoods, and carrying cases. Also checked out to be fully servicable-ready for use. Very limited supply available. Spare filters and inlet seal sets also available.