This advert doesn’t add much to the advert of May 1914. This was the last ad for a derailleur in the TCF Revue Mensuelle before the horrors of Verdun...

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: June 1914
• Derailleur brands: Boizot, Whippet
• Derailleurs: Boizot 4 speed