Text in russian on WW2 lid

[Egorka]

Also referred to here as "batch number" - "Н Парт" Maybe it's some kind of ammo/ explosive packing?If I see something similar, I'll write here.

But this and similar items (boxes) are normally made of zink and also quite thin.
The plate here is 3mm thick, right?

[dimmuborgir95]

This photo is for only example, nothing more. It's something like "thinking out loud".

[Jan]

But this and similar items (boxes) are normally made of zink and also quite thin.
The plate here is 3mm thick, right?

Yes it is!

Best, Jan