This advert from October 1938 does not mention derailleurs or 'changement de vitesse'. It is notable that an earlier, rather similar, advert from November 1937 does mention them.

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

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• Publisher: La Pédale Touristique
• Country: France
• Date: October 1938
• Derailleur brands: Idéal
• Derailleurs: none