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The back view of the Grönefeld Principia

 

While some laments the use of a solid rotor on the Grönefeld Principia, the 22-karat solid red gold monobloc rotor of the Principia is actually one of my favourite part of the movement.

It is extensively decorated by hand and features a frosted finishing which I personally find very attractive. Another pro of the rotor is it turns on a ceramic ball bearing which helps prevent wear and eliminates the need for lubrication.









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