Horological Meandering

. . .it's described as exclusive to BP though I suppose it could find its way into some other watch made by a Swatch group marque. I can't recall that it has though. Jack

Which would lend credence to MF's theory about why the Type XX used the Lemania movement as well: it was the only one available. _john

I think I read somewhere that it takes only 2 extra parts to make FP 1185 a flyback. So what makes it so difficult to convert the Lemania chrono in Breguet? Is it difficult to convert ETA2894 or 7750? Many thanks!

Hi loujo, "Adding" flyback (it's not really an addition exactly, but...) to a chronograph movement can be remarkably easy or quite a challenge, depending on the type of engagement mechanisms employed and the details of the construction. For the most part,... 

. . .something like this by you or Suitbert or someone else with actual bench experience without wishing that it was a full-on article with pictures so I could follow it more closely- I get the general gist of what you're saying but there are an awful lot...