Jaeger-LeCoultre Duometre a Chronographe: Double-Barrel Blast (VIDEO BLOG)

Darth Vader would approve of this Jaeger-LeCoultre Duometre a Chronographe in 18-karat white gold. The brilliant white case encloses a heart of darkness; this is the only Duometre a Chronographe variant to have been produced with the coveted black dial. And as a limited edition, it’s one of only 200 produced.

Jaeger-LeCoultre’s Duometre a Chronographe combines two watch movements in a single 42mm white gold case. Each movement features a separate drive train, a separate dial, separate controls, and a separate mainspring barrel. The in-house caliber 381 merges its two power trains at the point of the escapement, which provides an alternating beat for both movements. Two movements, one heartbeat; that’s the idea.

JLC created the Duometre to solve an age-old frustration that had vexed generations of watchmakers. When a complicated watch powers a secondary function such as a chronograph or calendar, the additional strain on the power supply slows both functions as the amplitude (beat energy) of the balance is reduced by the load.

Alternatively, a watchmaker can avoid the loss of amplitude by driving the complication directly off the mainspring, but that depletes the power reserve faster. The challenge is akin to what a truck driver faces when maintaining speed on the highway while towing a trailer. If he wants to use the same amount of fuel as he would without the trailer, he must drive slower and lose valuable time. Alternatively, he can apply more power to maintain the same rate as before loading the trailer, but holding the same speed with more towed load will burn more fuel.

JLC refuses to accept this compromise and solves the problem by doubling the number of trucks and fuel tanks. The Jaeger-LeCoultre Duometre a Chronographe can run for 50 hours with *or* without the chronograph engaged, and it can operate the stopwatch functions without any loss of timing precision on the time-of-day display.

The Jaeger-LeCoultre Duometre in white gold is a feast for the eyes as well as the intellect. Its unique matte black dial with white gold hands, numerals, and logo presents a sporty countenance that lends itself to a broader range of attire than the colored gold Duometre models. JLC applies logic to the dial’s rich color palette, white gold indications relate the time, and rose gold hands indicate the chronograph’s progress.

Twin power reserve gauges at the base of the dial track the state-of-wind within each mainspring barrel.

The case back of the Jaeger-LeCoultre Duometre a Chronograph is a study in haut-de-gamme watchmaking and finish. Each bridge and plate is crafted from golden-hued “German Silver,” an alloy of nickel and copper that is ruinously expensive to make, excruciatingly difficult to work, and breathtakingly beautiful if the first two hurdles are surmounted.

JLC clears the bar by a mile. Every bridge, lever, and wheel exhibits immaculate hand-laid anglage that shines with a mirror’s radiance. The depth of the movement is significant, and its honey-gold channels read as the canyons of a desert landscape. Each surface features intricate textures, grains, and polishing patterns that verge on sensory overload for the eyes. And the open architecture of the manual-wind caliber 380 leaves nothing to the imagination; all functions can be appreciated as they dance in a sublime chronometric choreography.

See this Jaeger-LeCoultre Duometre a Chronographe 18-karat white gold limited edition in high-resolution imagery on www.watchuwant.com