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Swiss model C (civil)
 Swiss model c complete |  front |  profile |
|---|---|---|
 inside |  head-harness assembly |  unopened filter |
 storage canister |  accessories |
Italian C.60
 c60 |  side |  inside 2 exhale valves |
|---|---|---|
 marking |  Pirelli stamp |  c 60 stamp |
Italian OPTICAL 1942 O.41 RS
Italian model 1931 (m.31)
 Italian m.31 |  inhale/exhale assembly |  Valve system |
|---|---|---|
 Industrial rubber articles (I.A.C.) |  inside (disregard spanner bar) |  Headharness showing exposed rubber |
 filter |  filter top |  filter base |
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