This advert claims that:

• Some kind of Fichtel & Sachs product was used to win the 1934 World Road Race Championship.
• This was the 6th time that this had happened.

It is unclear what role a derailleur played in any of these victories.

William Dumont was the French importer of Fichtel & Sachs products.

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

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• Publisher: L'Officiel A.C.M.
• Country: France
• Date: April 1935
• Derailleur brands: Fichtel & Sachs
• Derailleurs: Fichtel & Sachs