Belgian EV. 639

The Belgian Engelbert EV. 639 was made of thin black rubber, with plastic eyepieces and a portruding speech diaphragm.  It used a 25mm filter attached directly to the mask.  Most likely intended for civilian defense, this example was made by Engelbert in 1940.

 

Similar masks in my collection:  Belgian E.2

 

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EV 639