Created for a VIP client, the one-of-a-kind Berkley Grand Complication pocket watch took 11 years to complete and features the world's first Chinese perpetual calendar that is correct until 2200. The Chinese calendar is based on the lunar and solar cycles, making it one of the most complex to interpret mechanically. While others have created Chinese calendar watches, this is the first to appear in the form of a perpetual calendar. 

The watch is also endowed with a Gregorian perpetual calendar with retrograde date, a grand sonnerie with Westminster Carillon chiming, a triple-axis tourbillon, and a split-seconds chronograph, among many others. 

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Jaeger-LeCoultre has redesigned the Duometre collection, with the most impressive being the Duometre Heliotourbillon Perpetual that features a triple-axis tourbillon fitted a cylindrical hairspring and a perpetual calendar. The tourbillon is positioned at 9 o’clock, visible on the dial to better enjoy the spinning motion of the three titanium cages. 

The perpetual calendar features the classical grand date display at 3 o’clock; the year can be found inside the month counter at 6 o’clock while the moon phase turns inside the day counter at 12 o’clock.

This Duometre's Caliber 388 boasts two barrels and two gear trains, one to supply energy to the timing indication, the other reserved for operating the complications. Keeping the energy sources separate ensures a steady power supply to guarantee a high degree of accuracy. This is why you’ll find two power reserve indicators, flanking either side of the hour-and-minute counter. 

Limited to 20 pieces, it comes in a new 44mm pink gold case.

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And then there was Piaget, which took ultra-thinness to a new extreme with the Altiplano Ultimate Concept Tourbillon, just in time to celebrate the maison’s 150th anniversary. Measuring only 2mm in thickness, the watch is all the more mind-blowing when factoring in the fact that it also houses a flying tourbillon, held in place by the underside with the outer edge supported by a ceramic ball bearing. 

To save space, the caseback is also the movement mainplate while the crown is integrated into the caseband. Incredibly, it boasts a power reserve of 40 hours, the result of a custom mainspring and the systematic use of ball bearings that allow for the mobile elements to rotate thus reducing friction, which in turn allows the watchmakers to go even thinner. 

The handsome blue cobalt case is as thin as a coin. 

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