Swiss SM 64
The Swiss Bata SM 64 was a helmet type mask made of black rubber. It featured two round glass eyepieces, an elongated snout, and a cheek-mounted exhale valve. It was for use by rescue workers, and sometimes issued in pairs with a "Y" hose leading to either a single filter, or Pressluftatmer PA-2000 unit. The first example was made by Bata in 1964, and the second examples were made by Bata in 1965.
Maske = "Mask"
Pressluftatmer = "Compressed Air Breathing Apparatus"