This is the earliest advert that I have for Le Chemineau. It advertises 3 speed and 6 speed (double chainwheel) systems.

If you had spent 3 torrid years in the trenches you had earned yourself a 20 franc discount.

(Source gallica.bnf.fr/ Bibliothèque nationale de France)

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: February 1919
• Derailleur brands: Chemineau
• Derailleurs: Le Chemineau