Belgian A.N.P. M-51
The Belgian A.N.P. M-51 was a licensed copy of the French A.N.P. M-51. It was used by the Belgian military until it was replaced by the BEM 4 GP in the 1990's. This example was made by Companie Bergougnan Belge.
A.N.P. = Appareil Normal de Protection = "Normal Protection Device"
Similar masks in my collection: French M51/M53, French C38, French AJAX F2, Italian T-35, Italian PC-35