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It’s sometimes forgotten that while quartz watches are electronic devices, the quartz crystal itself is actually a mechanical oscillator – driven by current rather than a mainspring, but a mechanical oscillator nonetheless. At the very high frequencies at which quartz crystals operate they are generally significantly more precise than replica Richard Mille rm 72 a balance and spring, but their rate stability can still be upset by the factors that affect conventional mechanical watches. pas cher Richard Mille montres