The Roger Dubuis Excalibur Quatuor is made entirely of silicon (according to the brand, the first such watch of its kind), a material with half the weight of titanium and four times the hardness.
The Quatour — yes, the most expensive watch produced to date by Roger Dubuis — is equipped with the RD101 movement.
The precision of a movement is affected by the gravity of the Earth as the watch constantly changes position with the motion of the wrist. The tourbillon has provided a partial answer to this problem but the Excalibur Quatuor offers a new solution. The four carefully positioned sprung balances work in pairs to compensate immediately for the rate variations caused by the changes in position. What the tourbillon achieves over the course of a minute, the Excalibur Quatuor achieves instantly.
The Excalibur Quatuor is priced at 1 million Swiss francs (which translates to roughly around $1,125,000 U.S.).
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