This leaflet celebrates 25 years of the Le Cyclo helically driven derailleur. It refers to it just as le Cyclo - not as the Cyclo Touriste. I think the Le Cyclo derailleur dates from 1924 - so I think this leaflet possibly dates from 1949.

Describing the early development of the derailleur, the blurb acknowledges the role of Paul de Vivie - but ignores everyone else.

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• Publisher: Cyclo
• Country: France
• Date: 1949?
• Derailleur brands: Cyclo, de Vivie
• Derailleurs: Le Cyclo 4 speed