German Kareta-Nova

The Drager Kareta-Nova had a black rubber facepiece with large triangular eyepieces.  This example features an inlet for use with a bayonet type filter, which is missing.

 

Similar masks in my collection:  MSA All-Vision Chemical Cartridge, MSA All-Vision Diaphragm Chemical Cartridge, S&W All-Vision Diaphragm Chemical Cartridge, MSA All-Vision Diaphragm ChemOx