Thanks for that Black Knight, MS22001 is a US military specification, I guess. These masks were, I think, adapted in the UK to RAF requirements by fitted of a UK microphone and perhaps other changes, and then would have been given an RAF Section and reference number something like 6D/1234. This was marked on a rubber label glued onto the outside of the left cheek piece, unfortunately mine has come off with the passage of many years!
TerryP
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