Korean Samgong K1 방독면

The Korean K1 방독면 was made of black rubber with rounded triangular lenses, a central speech diaphragm, and filter port on the left cheek.  On the right cheek was a port for a drinking tube.  This example was made by Samgong in 1987.

방독면 = "Gas Mask"

Similar masks in my collection:  British S10