Waffen-SS Gas Protection NCO's Specialty Patch ('Gasschutzunteroffizier Ärmelabzeichen'). The trade/specialty insignia was to be worn on the lower left sleeve of the field blouse and the service tunic by qualified personnel. This example indicates a qualified Gas Protection NCO. The patch is showing a gasmask with breathing filter in silver/grey cotton threads on a black woolen background. Nice example in mint and unissued condition!