I am more than a little confused about the model names of the many and various Simplex pre-war derailleurs.

I believe that this is Simplex’s second design of fork derailleur now featuring a simple pivoting fork. I also believe that it was called the Simplex Selection.

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• Publisher: L’Institut national de la propriété industrielle
• Inventor: Lucien Juy
• Country: France
• Date: French application November 1935
• Derailleur brands: Simplex
• Derailleurs: Simplex Selection