The S6 respirator was introduced in 1966, however it was not until 1968 that serious trials began into developing corrective lenses that could be worn with the mask. Previously spectacles with thin flexible arms had been used, such as the example we looked at here, that did not interfere with the respirator’s seal around the face. For the S6 a different approach was taken and a pair of lenses that ‘plugged’ in to the mask were issued instead:The lenses were provided in the wearer’s prescription and came in a standard green plastic hard case to protect them:The box has a /|\ mark and NSN number moulded into the top:I am unsure if the ‘Mark 5’ refers to the case or the spectacles it contains. The lenses are actually quite a loose fit inside the box and rattle around a bit:There is at least one variation of the box and it can be found made of black rather than green plastic. The spectacles do not have any traditional arms to go over the ears and are sprung in the centre between the two lenses:The opposite side of the spectacles have a pair of metal pegs in this position:A selection of corresponding holes are moulded into the S6 mask above the nose, allowing the exact positioning of the lenses to be adjusted for the best sight picture:The two metal pegs are pushed into a pair of these holes and the spectacles are then held securely in the mask:It has actually taken me quite a while to add these spectacles to my collection, I did purchase a case off of eBay a few years back in the hope it would come with the contents, but sadly when it arrived it was empty. I am therefore very pleased to have added another little component to my Cold War respirator haversack and it is now looking far more complete than it did when I first did a kit layout for it nearly four years ago- perhaps an updated layout is in order.