My random translations of the photo captions, clockwise from top left are:

• Bordeaux-Paris 1932
• Super Simplex 1934
• Selection 1936
• Route Leger 1932

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Simplex
• Derailleurs: Simplex Bordeaux-Paris, Simplex Route Leger, Simplex Super Simplex, Simplex Selection