Ok, so I have this gas mask, its a checkoslovakian Fatra FM1d mask but with filter from german civil gasmask VM40. I have seen a few of these and I know the mask is not switched since I've seen others.
I find lists with the other production codes like RL1-38/4 and so on for the german made civil masks VM40.
This box is marked RL1-42/9.
Can anyone help me identify more on this code.?
I suspect its from Sudet when it was annected, am I right?