Introducing The Jaeger-LeCoultre Master Ultra-Thin Tourbillon Moon

Jaeger-LeCoultre's new Master Ultra-Thin Tourbillon Moon is a quite beautiful example of the genre, with some interesting additional technical features which help distinguish it from the rest of the crowd The full-rotor tourbillon movement is a relative rarity - JLC caliber 983, which looks to be the JLC cal 973 automatic tourbillon, but with the addition of a moon-phase and date indication.

The date indicator is a centrally mounted hand, which has a neat little trick up its sleeve, which is that at midnight on the 14th, it jumps from one side of the aperture for the tourbillon to the other, landing on the 15 This is to keep the date hand from partially obscuring the view of the flying tourbillon The main moon-phase display shows the Moon as seen from the Northern Hemisphere, but there is also, around the main display, a double-sided hand that shows the moon-phase in the Southern Hemisphere on the left, and the age of the Moon on the right. Source