In this advert Paris-based retailers Mestre & Blatgé advertise their Génial Lucifer Cyclo-Touriste Luxe bicycle. This is depicted with an interesting looking derailleur with a single pulley above the chain, in the style of (amongst other things) a 1934 Simplex Tour de France.

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

• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: September 1934
• Derailleur brands: unknown
• Derailleurs: unknown