W65 Self Rescuer Advantages: Provides emergency protection against carbon monoxide gas resulting from underground fires or explosions Total life of 15 years with an in-service life limited to ten years Rugged stainless steel case Weighs only 2.2 lbs. This is new old stock, never opened, in stainless steel case with a few dents on the top of the case near the letters MSA. W 65, I cannot see an expiration date, but the container is still factory sealed even though the decals are rough and unreadable. Looks like on the bottom the manufacture date was 10/93, and there is an S stamped on the bottom. NEW OLD STOCK, OUT OF DATE ITEM.