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In the world of high complications, the grande and petite sonnerie holds a very special place, well above even split-seconds chronographs, perpetual calendars, and certainly above the once-holy tourbillon. There are but a small handful of watchmakers, as individuals, or as brands, capable of producing such a watch. It is that special, and François-Paul Journe launched his Sonnerie Souveraine back in 2006, by himself.