Sundstrom Safety Anhydrous Ammonia Kit Full Face Mask H05-8621 - Acme Tools
Gas mask acid/organic/ammonia full face mask Gas mask paint chemical pesticide laboratory dustproof multi-function filter - AliExpress
Full Face Mask Acid | Chemical Respirator | Acid Ammonia Steam | Protection Masks - Mask - Aliexpress
Two MSA All Vision ammonia Respirators from the early 1940s (I assume) the head harness states the mask was patented 1921 but that's obviously not the year these were made. : r/gasmasks