I think the 'P & S' mark on the back of the blitz below might be an 'F & S' mark (as on the back of this sanitater M36 patch), with a bit too much white paint on the stamp. Too much paint makes these stamps hard to read.
I was just thinking that the wartime 'Uniform Markt' magazine might provide a source of information about these manufacturers, though we would still be guessing, matching initials in these stamps with manufacturers' names.
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