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| FATRA FM ? ex valve directly mounted on facepiece |
FATRA FM 1 A Light alloy filter/ex valve front piece |
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| FATRA FM 1 B Bakelite straight front piece |
FATRA FM 1 Bakelite bended front piece |
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| FATRA FM 1 detail the front p. don't allow to mount all filters, stokinet covered face p. |
FATRA FM3? Same as FM3A but light alloy front piece |
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| FATRA FM 3 b Bakelite front p. smooth rubber facepiece |
FATRA FM 3 a Same as FM 3 A but stokinet covered facepiece |
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| FATRA FM 3 C Same as FM3 A but rough rubber moulding |
VERNON French FM 3 A Vernon mark on ex valve cover and plastic eyepieces |
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| FATRA FM 4 A Bakelite front piece, smooth rubber |
FATRA FM 4 B Same as FM 4 A but rough rubber, both FM 4 are child models |
