The Chronomètre Souverain by François-Paul Journe is a manual winding mechanical calibre, the FP Journe 1304 Calibre is the first Journe movement to be totally produced in the ateliers that François-Paul Journe has just constructed at his Geneva facility.
The technical design of the piece was aimed at achieving the highest degree of stability of the various forces. To succeed, it meant using weaker springs than usual and placing them in series in order to gain greater stability over a longer period. Thus, two barrels in parallel are connected directly to the first wheel of the gear train, in a delicate manner but with great stability. The high stability range reaches a power reserve of 40 hours, then decreases to arrive at a maximum autonomy of 50 hours.
The FP Journe 1304 Calibre:

 30 mm in diameter and 3.70 mm in thickness

 In-line anchor escapement

 4-arm balance with inertial adjustment

 21600 vib/hour escapement frequency

 143 component parts excluding case

 21 jewels/plates and bridges in 18K rose gold

 55 hour power reserve





Full article in print copy of Europa Star BaselWorld/SIHH issue 2/2005

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