It was made, either by Sté Belge APC or Englebert.

It is a flat rubber moulding design without Tissot tubes.

The Bakelite frontpiece includes an annular exhale valve. Three different models of filter attachment has been manufactured, one with the common

Belgian 25 mm threading, the two otherd for exportation with the French 42 mm and with the German 40 mm treading.

The five points head harned is made of rubber straps.

A cylindrical can with shoulder strap is provided for the carrying af the mask