Recently acquired a second 3S mask. One by Auer, one by MSA. The Auer mask carries far less markings compared to the MSA, but Auer is mentioned on both masks. : r/gasmasks
MSA 3S Basic Plus Full Face Mask | MSA Safety Shop
MSA 3S Full Face Mask | MSA Safety Shop
BASIC FACE MASK MSA 3S - G. Fox
Genuine MSA AUER brand Black MSA Full Face mask 3S Gas mask breathing apparatus | eBay
3S Full-Face Helmet Mask in Supplied Air Respirators (SCBA) | MSA Safety | Netherlands