The person who sold it to you was correct - The Dancing Chain has mistakes, a huge number in the 1st edition and still some in the 2nd edition. Your derailleur is a Tour de France twin cable - these were sold for a short time in the early 50s though they do not feature in any Simplex catalogue I have seen though are on a Fonteyn list. There will be a history of Simplex push-rod derailleurs in a future Boneshaker, Gordon Selby wrote an article a while back which he is now finishing off and revising in the light of more recent knowledge. The arm is common to the standard Tour de France.
Hilary Stone, Bristol, England
Peter Brown wrote:
> I gave the wrong link to the photos in my last posting. It should be
> http://www.virginmediaphotos.co.uk/
> http://www.virginmediaphotos.co.uk/
>
>
>
> Peter Brown, Lincolnshire, England