F.P.Journe Chronomètre à Résonance 20th Anniversary Edition

When François-Paul Journe presented his first Résonance wristwatch in 2000, it was baptized Résonance under the patented brand name Résonance®. The F.P.Journe Chronomètre à Résonance is the only wristwatch in the world that utilizes the physical natural resonance without any mechanical transmission phenomenon, previously known as double pendulum or double balance.

Each of the two balances alternately serves as exciter and resonator. When the two balances are in movement, they enter into harmony thanks to the resonance phenomenon and begin to beat naturally in opposition. The two balances then support each other, giving more inertia to their movement. This result is possible only if the difference of the frequency from one to the other does not exceed 5 seconds per day cumulated on six positions. Their setting is an extremely delicate task.

Whereas an external disturbance affects the running of a traditional mechanical watch, the same disturbance, for the Chronomètre à Résonance, produces an effect that accelerates one of the balances as much as it slows down the other. Little by little, the two balances come back towards each other to find their point of harmony, thus eliminating the disturbance, and beating in perfect synchronization.

This emblematic watch that distinctively signs François-Paul Journe’s horological research on precision was awarded “Montre à Grande Complication” at the Grand Prix d’Horlogerie de Genève in 2010.

François-Paul Journe has conceived several versions of his wristwatch throughout the last 20 years; the first 20 by Subscription (2000), the first collection series (2001), the Ruthenium series (2001-2002), with movement in 18 K rose Gold (2005), the digital 24 hours Résonance (2010), the analogic 24 hours Résonance (2019), and the new Chronomètre à Résonance (2020).

F.P.Journe Chronomètre à Résonance 20th Anniversary Edition

The new Chronomètre à Résonance has only one single barrel spring to provide power for the two movements. A differential placed on the first wheel, visible in the centre of the dial, transmits, independently, the energy of the barrel spring towards the two secondary gear trains. Each secondary gear train is equipped with a Remontoir d’Egalité of a frequency of 1 second. Working in such a way, the force received by the escapements remains linear and assures isochronisms throughout 28 hours.

F.P.Journe Chronomètre à Résonance 20th Anniversary Edition

The Chronomètre à Résonance features a redesigned case with a crown now placed at 2 o’clock easing the winding of the watch in position 0 and the time setting in position 2, clockwise for the left dial and anti-clockwise for the right dial. The pulling of the crown at 4 o’clock simultaneously resets both seconds.

F.P.Journe Chronomètre à Résonance 20th Anniversary Edition

On the movement side, 2 remontoirs d’égalité (constant-force device) provide a linear force to each of the two balance springs to remain isochronous during 28 hours.

F.P.Journe Chronomètre à Résonance 20th Anniversary Edition

This model is available with a case in Platinum or in 18 K 6N Gold in 40 or 42 mm diameter. The dial is proposed in 18 K white or 6N Gold with 2 hour subdials in whitened Silver Guilloché clous de Paris. Leather strap or Gold or Platinum bracelet.

F.P.Journe Chronomètre à Résonance 20th Anniversary Edition

Technical Specifications

Movement
Calibre 1520 in 18 K rose Gold
Manual winding / 31 turns of crown

Dimensions
Overall diameter: 34.60 mm
Casing-up diameter: 34.20 mm
Overall height: 7.97 mm
Height of winding stem: 3.39 mm
Diameter of stem thread: S1.20 mm

Balance
2 Independent linear escapements, 15 teeth
2 Independent balances with 4 inertia weights
2 Flat micro-flamed Anachron balance springs
2 Mobile stud carriers
Free sprung
2 Springs laser pinned to Nivatronic collets
2 Pinned GE studs
Frequency: 21’600 v/h, 3Hz
Inertia: 10.10 mg*cm2
Angle of lift: 52°
Amplitude: 0 h dial up: > 260°
24 h dial up: > 260°

Main Characteristics
2-position winding crown at 2h
Manual winding in position 0
Time adjustment in position 2: clockwise for the left dial and anti-clockwise for the right dial
Resetting the seconds to zero by pulling the crown at 4h

Indications
Double time display:
Left analog – indicating 24 hours
Right analog – indicating 12 hours
2 small seconds at 6h
Power reserve at 12h

Total Autonomy
42 hours
Efficient running time: 28 hours ± 2

Finishing
High quality
Partial circular graining on baseplate
Geneva waves on bridges
Screw heads polished and beveled, with chamfered slots
Pegs with polished rounded ends
Steel components hand-finished

Dial
18 K white or 6N Gold and whitened Silver hour dials with guilloché clous de Paris

Case
Platinum or 18 K 6N Gold
Diameter: 40 or 42 mm
Total height: 11 mm

Number of parts
Movement: 378
Cased up with strap: 427
Jewels: 62