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Rolex

It's definitely not as big of a deal as the dual wheel escapement!

 

But it is a wear item. The ends that are in the metal rub and rub so if it were steel, this metal would eventually rub away. So this is definitely a step in the direction of keeping the watch service intervals longer. To craft something so small in ceramic is also not easy. Ceramic is also very coarse, so it may actually wear down the metal surrounding it too!
The dual wheel escapement is a big deal. You rarely see this on a watch that doesn't cost many multiples of this watch's price.

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