Canadian C3 Gas Mask Listing. Canadian C3 Gas Mask. Genuine Military Surplus. 1985 Issue. COLLECTIBLE ONLY – NO FILTER INCLUDED? You are viewing a genuine Canadian Armed Forces C3 Gas Mask. A staple of Cold War era Canadian kit, this mask is known for its durability and distinct profile. Of Quebec, a known contractor for the Canadian military. The chin is clearly stamped “BARON85″, confirming its production in 1985. Yellow Stencil “CA 11 7 85″ on cheek. Rubber: Flexible and supple with no visible cracking. Lenses: Original glass eyepieces are intact. Filter Port: 60mm threaded inlet (Note: Standard NATO filters are 40mm and require an adapter for this mask). Head Harness: 6-point elastic harness is present and functional. Feel free to reach out with any questions or offers.