Canadian C3 Respirator
The Canadian C3 was Canada's updated version of the British Light Anti Gas Respirator. This example is missing its 60mm filter, and was made by General Tire & Rubber in 1972.
Similar masks in my collection: British Mk I
Stamps on cheek "GTR 70 Normal"
C3 interior view
C3 speech diaphragm (dented)
Filter stamp side view "JUN 82"