This low-res, deliberately smudged, scan is taken from the web site of the excellent Musée d'Art et d'Industrie in St-Étienne.

• Publisher: L'Industrie des Cycles et Automobiles
• Country: France
• Date: March 1931
• Derailleur brands: Charvin
• Derailleurs: Charvin Le Lautaret (1st style)