Hi Guys, this is a hard to find version of the standard British respirator. They were issued to troops who due to the nature of their work could not wear the respirator bag in the usual "ready" position on the chest. As a result, the postion of wear was changed to the side of the body.
This particular example, from my wife's Lez's collection, was issued to an ATS girl who worked on the "Ack - Ack" guns. Note her name and serial number inked to the flap of the bag.