French A.N.P. T-31
The French A.N.P. T-31 used the same cloth facepiece as its predecessor the A.R.S., but had a completely different metal inlet/outlet assembly. It was issued to French soldiers during World War II. This example is equipped with a corrugated rubber hose and was made in 1937.
A.N.P. = Appareil Normal de Protection = "Regular Protection Device"