Gas cylinder screw

[A. F Medic]

I just looked at the screw and I see it is marked with a "BMB" and also a "P". What do they stand for?

Information

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[rider]

Breda Meccanica Bresciana As far as I know, "P" is a proof mark.

[Bill Ricca]

The P marking came out late is WWII, to designate "Poppet". It made it easier to tell them apart from the non-closing lock screws, which were being eliminated from use.

[A. F Medic]

Further confirmation that my M1 is a Danish send back. Thank you all.