Don't do it! -2-
We were surprised to see these mainsprings. They were broken but have not been replaced, even if they are very common mainsprings. Somebody tried to "repair" them in a particular manner. The first one was found on a pendulum clock, the second on a Zenith pocket watch. The repairers must have spent a lot of time to do this job, so there is really no reason for it: it's wrong from both the technical and the economical point of view.
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