The Atem Schutz Maske 13029 was very similar in design to the Austrian M-34, although produced much later with updated materials.  The facepiece was made of rubber and most of the other parts were made of plastic, which could be easily replaced.  They were used for civil defense and equipped with a red filter.  This example was made by MLW and is missing the filter.
Atem Schutz Maske = "Respiratory Protection Mask"