German Degea Vollmaske 747

The German Degea D.R.P. Vollmaske 747 was made of rubberized cloth with round glass eyepieces. This example was made by Degea in the 1930's.
Vollmaske = "Full Face Mask"
Similar masks in my collection: German Vollmaske 744, German Degea Ledermaske, Swedish Typ 9