This is the first version of the infamous Simplex Tour de France - with a banana shaped main plate (see French Registered Design # 37803-001 for the second version).

1946 is an interestingly early date for what is clearly the finished article.

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• Publisher: L’Institut national de la propriété industrielle
• Inventor: Lucien Juy
• Country: France
• Date: French application September 1946
• Derailleur brands: Simplex
• Derailleurs: Simplex Tour de France