The E-I was the firts Estonian produced gas mask, derivated from the ARS. It was meant to replace the British SBR mask
The mask is made of rubberized brown canvas and is held onto the face with a 5-points head harness with an addtitional nec strap. The valve housing is a circular metal piece with a thread on the bottom side and the exhale vale is over the thread. The eyepieces are made of celluloid.
Later a civilian version was available for the public which differed from the military version in that the rubberised canvas was changed to black leather.
Originaly it came with the E-I filter but later it was issued with a Dräger 455 and 42mm to 40mm DIN adapter.
It comes with the facepiece, filter, spare celluloid lenses and a tube carrier.
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It started production in 1927 and ended in 1938. Sizes should be V -Väike (Small) K-Keskmine (Medium) S-Suur (Large). It was meant to replace the British SBR mask