Vietnam era M28 Respirator dated 1969.
Known as the Grasshopper due to it's shape and colour.
The mask was designed to offer a lighter weight alternative to the M17 mask, the carrier states the mask is only suitable for use against riot control agents and not NBC material.
Very good condition World War 2 British Wardens respirator complete with a war office stamp. Officially called a Civilian duty respirator.
Interestingly the flapper valve is red as was used in the "Micky Mouse" children's respirators, this is most likely because the mask was made using the same batch of red flapper valves the children's masks used.