US MSA All Vision with ClearTone Diaphragm

🇺🇲 United States M-S-A All Service Model "S" Gas mask with an All Vision Clear Tone Diaphragm facepiece dated 1958, Bureau of mine approval No.1434

This particular Respirator comes with a facepiece of the MSA All Vison, though this was retrofitted with a later model Clear Tone Diaphragm from the 1950s.

When I originally received this crate, it came in with two completely exploded All Service Ultra Filter Canisters, which lined the box with charcoal, paint, and rust.

Unfortunately, the facepiece to this kit is badly malformed and stiffened, and I do not know how to revert this damage other than keeping a handmade faceform in the facepiece.

The crate of this mask is, unfortunately, rather dilapidated on the top, though it does state that these were trademarked and registered in Canada as well as the United States.