The M1931 was an Italian designed mask adopted by the Belgian army. This design and its later iteration were in service for twenty years. The design was inspired by the industrial Tipo L gas mask, which was almost identical.

Mask overview Edit


M1931 exhale valve

The M1931 mask's facepiece was made of a two layers beige rubber, milled on the outside and smooth on the inside. The head harness had six straps. The eyepieces were made of three layers, two glass ones and a cellulose one, and they were 50 mm wide. Inside the mask, there was a sponge layer that helped to prevent fogging while wearing the mask. The intake-outtake piece is connected to the mask at the bottom and it has a pipe for the hose and one for a flutter valve, which was protected by a metal sheet that goes around it. The filter was attached through a pleated hose to the aforementioned piece and itself was stored in its bag.

M1931 filter


M1931 kit

Filter Edit

The filter is a metal box stored in the satchel and connected to the mask by a hose. This kind of filter was quite small compared to previous Belgian issues, and it had two reinforcing rods inside to prevent it from opening.

Kit Edit


The exhale valve covered by its dedicated cloth


M1931 satchel

The mask comes with its filter in the M1931 issue satchel, although sometimes this kind of bag was replaced with the later M1934 satchel. The exhale valve is covered by a small cloth to protect it from damage.

Inside the bag, there was also a metal cylinder which contained a stick of anti-fogging soap.

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Anti-fogging soap

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Anti-fogging soap in its container

Markings Edit


1932 Sacic M1931 kit


Pirelli 1931 marking

The M1931 was made mainly by Pirelli, but some of the production shifted to Sacic (which is a Pirelli branch located in Brussels). On the left cheek of the facepiece, there is the company name, the date and the size in roman numbers.
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