Gas mask model 1931 of the French army.

Gas mask M31 of the French army, with the mask, the supple flexible hose, the filter cartridge and the transport bag. Missing, the spare glasses and the cylindrical boxes containing the chloride of lime. The mask was manufactured by the Luchaire establishments in 1938, the cartridge dates from 1939. Stamp "TO" on the flap, "Ordinary Size". Gas mask never used, because a lead is on the headdress with a "Z" on one side and two crossed guns on the other. Could be an assignment in an artillery regiment ?