The facepiece of this mask is of the same design as the ARS 17 but the general shape is different.

I has a smaller frontpiece casing allowing to has a smaller dead air volume inside the mask.

The celluloïd eyepieces are mounted in metalic rings setted on the facepiece and tightened by outside screwed second rings

The head harness is a seven points, elastized straps, model.

This mask, was perheaps proposed as prototype for the French Army after the WW I to remplace the ARS 17 but was never commissioned and was sold for the industrie with various filters against different chemical products.