This La Gauloise bike has a 6 speed transmission that, seemingly, includes two chains and a BSA 3 speed hub. I can’t quite work out how these two elements might be combined.

It was, possibly, bought new in 1911.

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: May 1912
• Derailleur brands: de Vivie, BSA
• Derailleurs: none