The don't look original. This post needs to be isolated from the movement plate. I had very similar thoughts to yourself regarding the iso spring. Their supporters claim that interruptions are generally short and that an approximate time is better than no time at all whilst their opponents claim that it is an illusion to know time if it is wrong and that it is better to know that one does not know Case form: The pendulum and its contact can work alone, without any wheels. Magneta clock by Martin Fischer of Zurich, around
On the Horologix website there are pictures of S.
Quotations from second hand watches Bulle autres horlogerie
The clock has a small wooden case and the movement does not seem to be of the same quality as my other Bulles, the label says it was supplied by Bulle Products Ltd, London although the movement is stamped 'France'. It is the same movement as posted in an earlier thread Unknown clock running too slow. The Manufrance is a convention iron U-shaped magnet, though the vertical limbs are quite a lot shorter than you find in XC or Clockette models. An early 20th century French electric timepiece. It should be, at xxxx time it was yyyy minutes off. Swiss, attributed to Frederic Louis Favre-Bulle.