The S10 gas mask protected against penetration of dangerous nuclear, biological and chemical substances. The S10 also featured a drinking tube that can be adjusted from the outside of the mask. The S10 was introduced in 1986, and was in service until 2011.
Mask will come with one filter attached 
These masks should be considered as a collectable, and cannot garuntee any legal protection. 
DPM Haversack included.
Grade one used, will have signs of use, may have scratches on lenses/ names or numbers on rubber