An original WW2 / 1938 Dated Czech Army Gas Mask with filter.
It is in very clean condition and dates to just prior to the German Army occupation.
This is a rare variation based on the British Army design of the period. The filter is dated 1938 CH... and the hose connector to the mask is dated 1936. The mask is maker marked FATRA 2 on the inside.
In 2013 a Facebook group valued this pattern online at $300 and stated that it is very rare because it was only issued for a short period of time.