Swiss SM 74
The Swiss Huber+Suhner SM 74 was an upgrade to the previous SM 67. One of the main differences was its exhale valve was placed above the filter inlet. This example was made by Huber+Suhner in 1986.
Similar masks in my collection: Swiss SM67
Stamps on cheek "86 L"
Stamp on forehead
Filter top view "LUWA"
Filter side view
Sealed filter container top view "Swiss filter ABC Schutzfilter 74"
Sealed filter container side view
Bag for SM 74
"Personliches ABC Schutzmaterial" (Personal ABC Protective Material)