Its 30.50mm diameter sports 27 jewels, a KIF anti-shock system, Glucydur balance and a Nivarox balance spring.
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Moreover, in many ways, it will do the job better than a metal balance spring.
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Other details: A balance spring with Breguet overcoil, the mobile stud holder.
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The balance spring is etched out of a thin silicon wafer using a photolithographic technique, similar to that used for microelectronic chips, so its exact shape and thickness can be more carefully controlled than with metal.
This is because the silicon in question is a spiral designed to take the place of the balance spring in mechanical watches.
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