This gas mask comes with filter but the head strap at the back has been torn,other then that its in good condition for its age.The S6 NBC Respirator was a protective gas mask issued to the British armed forces. It was developed in the 1950s and first issued for general service from 1966 and then onwards. In 1986 a new replacement respirator was accepted into service, this being the S10. Initial issue of the S10 was on replacement only basis and as a first issue item to new members of the armed forces. It took a number of years before all members were issued the S10.