I bought this mask from a Surplus shop in St.Augustine. The man told me it was a Polish MP5 but i thought it looked more like the French Arfa which the MP5
Polish Tan MP5 Gas Mask With Filter - Military Surplus-SURVIVAL-B.O.B | eBay
FILTRACYJNA MASKA PRZECIWGAZOWA MP-6 – Produkty specjalne - Maskpol - producent sprzętu ochronnego dla Wojska