The Belgian A.G.15 used a rubber facepiece similar to the M1931 and M1934. It featured two 60mm glass eyepieces, and an exhale valve and filter connection in one metal assembly. Intended for civilian use, this example was made by L'Anti-Gaz in 1938.
L'Anti-Gaz = "Anti-Gas"
Manufacturer and model stamp on cheek
Stamps on head harness
Marking inside lens
Filter stamp and inscription top view "538" "D. Fulton"
Filter stamp and inscription bottom view "W.35 P BREVETE" "Dave Fulton"
Filter stamp side view
Filter manufacturer side view "L'ANTIGAZ SA BELGE"
Owner's name inscribed on side of filter "D. Fulton"
Owner's name inscribed on front of filter connector "D. Fulton"