French Patent # 739,662 - Simplex

French Patent 739,662 - Simplex main image

Frank Berto describes this model, without the chain retaining device marked 12, as the 1934 two speed Simplex Champion de France. The patent is, slightly confusingly, dated 1932.

One interesting feature of this patent is that it may show the first recognisably modern rear dropout with an integral derailleur hanger.