A.G-5
The A.G-5 mask is a Belgian gas mask produced by L'Anti-Gaz in the 1930s. The design of the mask is based on the Italian P43 mask that has been copied and modified many times. Looking at it, it's hard not to notice that it's not like other masks, the first thing you probably fixed your eyes on are the 2 exhalation valves. This solution was dictated by the fact that it was possible to buy a microphone set for the mask. This allowed telephone operators to work even during an attack. In order to screw the microphone set, one of the valves had to be unscrewed from one side or the other. Another very interesting thing is that the mask has a 25 milimeter thread that has not been used in any other mask. It is possible that this was due to the fact that the manufacturer wanted to force you to buy only his combined filters, but this is just my theory. The mask, although from a distance may seem material, is made of thick, decent rubber corrugated on the outside. The masks were most likely only made in 3 sizes (mine is a size 2). The manual is written in 2 languages: Dutch and French, which are the 2 official languages of Belgium. The manual applies to 2 similar models A.G-5 and A.G-10. The face parts of both masks are the same, the difference is that A.G-10 is a mask for people who actively perform work (e.g. digging trenches, etc.) and A.G-5 for people who, for example, worked in the headquarters and did not have to move so much.
As of August 12, 2023, this is my oldest mask in the collection
Update 1 August 28 2023: Now A.G-5 is 2nd oldest mask in my collection
