French / Belgian Gas Mask Model 1951 C.B.B - Military ANP51 (APPAREIL NORMAL DE PROTECTION). made by These were made by Bergougnan Belge (Companie Bergougnan Belge) in license from the French company GIAT (Groupement Industriel de l’Armement Terrestre). Made from 1951. Used not only in France but also for long times in Belgium. His ancestor was the C38. It came with a cannister from 1980s which is not for this mask. The M-51 CBB was from the 1950's - 1960's era. It was a French / Belgium Gas Mask. It was light weight and specially designed for extended use with superior comfort, secure fit, an impermeable rubber material for high resistance to NBC agents. It has Impact resistant plastic lenses. A comfortable nose cup with controlled air flow to eliminate internal fogging and C02 buildup and a Five-strap, highly elastic head harness for quick and easy donning and simple adjustment.