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Audemars Piguet

To improve the stability of the movement operation.

 

There is no differential here nor resonance effect. The idea is to make the balance wheels oscillations more stable even in vertical position. We have here two balance wheels and two hairsprings and the objective is to make them auto-regulate.
It is NOT the same system seen in the Millenary Quadriennium or with Moser (two hairsprings only).
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