This British Army GSR Gas Mask with Respirator Filters is a military-grade collectable item used by soldiers in Great Britain from 1945 to the present day. The gas mask, also known as a protective mask, is designed to provide protection against harmful gases and chemicals, making it a critical piece of equipment for military personnel. This particular size 4 gas mask is brand new in box, ensuring its authenticity and usability for collectors or enthusiasts of militaria.