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Swiss SM 67
The Swiss Huber+Suhner SM 67 was made of black rubber, with two round glass eyepieces, and an exhale valve below the filter inlet. This example was made by Huber+Suhner in 1973.
Similar masks in my collection: Swiss SM74
Stamps on cheek "0" "01-73 L" "1"
Stamp on metal eye ring "U-6551-IIB 2"
Filter top view "TECHNIC AIR"
Filter bottom view
Filter side view
Bag front view
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