Vintage Gas Mask with original Canister and Canvas Case or Bag. I am selling this "as is" as I know almost nothing about this kind of equipment. My husband bought it at an estate consignment auction about 5 years ago. One strap on the head piece has come apart in one place, I think through disintergration. I'm posting a number of images. Let me know if you need an image of another part of it. The metal canister has three numbers printed on the top...12, 15, 15. On the side of the canister is printed 111-5 and 811-3-81. On the bottom of canister is printed the numbers 42, and 0. As for the mask, under the chin area is embossed into the rubber M-51...111...56 and on the other side of under chin area is C . B . B. and a 2 under that. The canvas bag is stamped FH-ZM...726819...10714. The canvas bag is in really great condition and measures 12.5" by 5.5" by 5.5". See images.