Soviet/Russian PPM-88/GP-9 Gas Mask

Soviet Union and later Russian Federation PPM-88/GP-9 respirator. Intended for civilian and civil defence use. The GP-9 has a panoramic lens, an oral-nasal cup and a voice diaphragm making it technically superior to the earlier Soviet masks.
Sadly my model has a broken voice diaphragm which compromises the seal of the mask.