I added this beauty to my collection! stamped: 10 42 so I'm assuming October 1942. I considered a replacement bladder briefly but I'm certain the retaining c clip rings would crumble if I try to pry them off and since 60% of the original bladder is still there I'm leaving it as is. also the cardboard shape retainer is still in the mask so I am also assuming this mask was never issued. Its the early leather strap version. I have a comparison shot with my modern replica. (I can see now the replica company threaded the strap incorrectly through the card retaining clips, placed the leather straps on the opposite sides that they should be and placed the black nose cap on upside down! also the cardboard retainers are painted the incorrect color so I'm going to fix all of that on the replica. also their mold isn't fully accurate especially on the interior but it looks good on display. The original will be placed in an acid free shadow box away from sunlight for preservation. I guess I am now a goddam AAF museum!