The ultimate feat of watchmaking: The Grande Sonnerie complication

All you need to know about horology’s most demanding creation.
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Patek Philippe Grandmaster Chime

There isn’t enough room to list all 20 complications in the world’s most complicated wristwatch, but rest assured it lives up to its name with a grande and petite sonnerie, minute repeater and even an alarm with time strike and date repeater, among others. The numerous displays had to be split up into two dials, and the Calibre 300 that made it all possible comprises 1,366 parts and holds six patents.

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