This is a head-harness for the General Service Respirator.
GSR Gas Mask Head Strap / Harness Ex British Army Issue (still27)
Scott Respirator Harness M-95 Gas Mask CBR NBC FRR GSR, Avon S10 FM12, Forsheda
Supergrade GSR Gas Mask FRR Strap Respirator Harness CBRN Headband + Clips
Vintage British Army Avon S6 Gas Rubber Gas Mask Respirator Rare Left Hand
German W.W.2 GAS MASK CONTAINER WITH GAS MASK AND GAS CAPE BAG
Vintage British Army Avon S6 Gas Rubber Gas Mask Respirator With Flash Hood
