This highly-coveted, 40mm platinum F. P. JourneChronomtre Rsonancewatch is in excellent condition and has perfect mechanical functionality. First introduced in 1999, the Chronomtre Rsonance was the second serial production watch by .It has since become synonymous with the watchmaker, as one of his most ingenious and recognised inventions.

CHRONOMTRE RSONANCE

The Chronomtre Rsonance RNmovementin this example is comprised of two balance wheels, inspired by a natural phenomenon called resonance. The complication is explained by Franois-Paul thusly;

In a watch, never mind which, there is energy which dissipates. When you listen to a watch, the tic-tac of the balance is dissipating energy. In a resonance chronometer, there are two balance wheels which are placed sufficiently close to one another, and the dissipated energy of each is caught by the other, leading to a unique type of frequency regulation.

The discovery is said to have been made in 1665, by Dutch mathematician Christiaan Hygens, who reported that two pendulum clocks, hanging from the same mounting beam, would beat in such perfect duplicity, that the sound of the escapements were indistinguishable from one another. The concept was later researched and developed by Antide Janvier, to be refined by Abraham-Louis Breguet. Early sceptics suggested that air-resistance played a role, however, extensive testing by Breguet (the first to test a dual-train resonance watch with a double-balance system, placing rings around the balance wheels, to negate the effects of air), and more recently by Franois-Paul, proved this to be untrue.

Whilst the concept was long established, the term resonance was in fact coined by Monsieur Journe himself, likening the phenomenon to that of a stringed musical instrument, which resonates.Initially, unsuccessfully attempted in a pocket watch in 1983, Journe was able to hone the phenomenon of acoustic resonance in a wristwatch some fifteen years later, with the prototypes displayed at his first Basel Fair in 1999. Ever since, the model has gained a cult status among collectors.As , an independent watchmaker who previously worked for Journe, put it, When I think of Francois-Paul Journe, I think of the Resonance.

THE DESIGN

The Chronomtre Rsonance is quintessentially an F.P Journe, in both its design language and movement. Housed in a classical40mm dress watch case, it is made distinctive by F.P. Journes signature flat crown with a rope-like pattern. The white-gold dial is delicately textured, and displays two separate silver guilloch dials for the hours and minutes (the two opposing dials capable of displaying multiple time zones). The words Invenit et Fecit are inscribed below the two subsidiary seconds (Latin for 'Invented and Made') in classic F.P Journe style - a nod to signing conventions of a century ago. The signature hands form a distinct contrast to the silver and grey dial. At 12 oclock is a power reserve indicator of 40 hours. Overall, the dial layout is clean and highly legible.

Interestingly, the power reserve indicator of this Chronomtre Rsonance is reversed from the norm, beginning at 40 and progressing to 0. This was deliberate by F.P. Journe, who borrowed this from marine chronometer clocks. The reasoning behind this lies in the idea that the power reserve indicator of the Chronomtre Rsonance is not meant to display how many hours are left, but instead how many hours have passed since the watch was wound.

This manual-winding, F.P. Journe caliber 1499.2movement is 18k rose-gold, with fausses-ctes embellishments, constructed with 36 jewels. It features a resonance-controlled, twin independent gear-train, straight-line lever escapement, monometallic 4-arm balance with 4 timing weights, self-compensating free-sprung flat balance spring, oscillating at a rate of 21,600 vibrations per hour. Further to this, a winding crown at 12 oclock adjusts both time-zones, with a crown at 4 oclock to synchronize the seconds hands.

THE MOVEMENT

This manual-winding, F.P. Journe caliber 1499.2movement is 18k rose-gold, with fausses-ctes embellishments, constructed with 36 jewels. It features a resonance-controlled, twin independent gear-train, straight-line lever escapement, monometallic 4-arm balance with 4 timing weights, self-compensating free-sprung flat balance spring, oscillating at a rate of 21,600 vibrations per hour. Further to this, a winding crown at 12 oclock adjusts both time-zones, with a crown at 4 oclock to synchronise the seconds hands.

THE TRANSITIONAL 1499.2

With the introduction of the Gold Era in late 2004, F.P. Journe introduced a slightly updated version ofChronomtre Rsonanceknown as theRN (Resonance Nouveau), or 'New Resonance'. With this introduction, all existing movement calibers were issued with new caliber codes. In the case of the Chronomtre Rsonance RN, this was referred to as the calibre1499.2; indicating the second version of the movement.

The ref. RN used two movements; caliber 1499.2 (seen in this example), representing the change to rose-gold and later the 1499.3, to indicate a newly updated power-reserve. It's understood that few of the1499.2 movements were made during a transitional period between 2005 to 2006 - consequently, occurring in smaller numbers than first-generation, brass-movement pieces. You can about this in s in-depth study.

THE SET

This F.P. Journe Chronomtre Rsonance RN comes with an original F.P Journe, black alligator strap, agreygrained leather strap with curved ends (measuring 20 x 19mm) and corresponding platinum tangbuckle. It's also accompanied the original inner and outer boxes, stamped guarantee card, booklet and servicing paperwork from F.P. Journe (from April 2020).

Viewings can be arranged in Central London by appointment.

Closer look