Testing the Finnish M39 Civilian Gas Mask

Testing the Finnish M39/Folkgasmask 39 Civilian respirator/gas mask made in 1939, amazingly Polish normalised filters somehow fit on this mask.
Even more amazingly this mask that is nearly 80 years old still works!
This should hopefully put an end to rumours that masks once they get a bit old magically stop working, it all comes down to build quality, storage conditions and having a new working filter for the masks.
Obviously I am using a modern filter in the video, not the old asbestos WW2 filters.