The Italian Maschera Antigas T.35 featured round glass eyepieces and a central speech diaphragm.  They were designed for both military and civilian use, and many were exported to Spain during the Spanish Civil War.  The second mask is such an example, equipped with a Spanish C.M.P. filter.  Both of these were made by Pirelli around 1935.

Maschera Antigas = "Gas Mask"