This image on this advert depicts a Cyclo derailleur, viewed from the right rear of the bike. It was a type of image the Cyclo used again and again (with subtle changes to the exact gear shown) - and this is one of its earlier apearances.

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

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• Publisher: L'Industrie des Cycles et Automobiles
• Country: France
• Date: March 1936
• Derailleur brands: Cyclo
• Derailleurs: Le Cyclo