The latest addition to Jaeger-LeCoultre’s Master Ultra Thin collection is a testament to the brand’s horological prowess and refined aesthetics. This new timepiece, the Master Ultra Thin Moon, distinguishes itself from its predecessors with a striking dial that commands attention. The dial of the Master Ultra Thin Moon is a captivating gradient blue, a design element that seems to draw inspiration from the brand’s recent Polaris releases.

Texture & Color

These releases have been known for their bold exploration of texture and color, and it appears the Master Ultra Thin Moon is following suit. The blue dial is tastefully accentuated with gold triangles marking each hour, and a moon phase display and calendar positioned at 6:00. The overall effect is one of balance and refinement, precisely what one would expect from a timepiece of this caliber.

The dial’s blue tones are beautifully complemented by the rose gold case, which measures 39mm in diameter and 9.3mm in thickness. This size is a key aspect of the watch’s appeal. It’s a dressy watch that’s been designed with a casual, everyday size, giving it a contemporary feel. While a smaller diameter of 36 or 37mm would still have been fitting, the slightly larger size nudges it towards being a dressed-down dress watch, a category that holds a special place in my heart.

Jaeger-LeCoultre has always excelled in this area. The Reverso, for instance, is a perfect example of a dress watch that shines even brighter when worn casually. The Master Ultra Thin Moon, even in gold, exudes a similar charm at this size. The timepiece is powered by JLC’s Automatic Calibre 925 movement, which features a skeletonized and solid gold winding rotor. Despite its compact size, the movement boasts an impressive 70-hour power reserve.


The Master Ultra Thin Moon is water-resistant up to 50 meters, although it’s advisable not to swim while wearing it. The watch is fitted with a blue alligator strap, further enhancing its aesthetic appeal. The Jaeger-LeCoultre Master Ultra Thin Moon is priced at $23,000. It’s a timepiece that marries the brand’s watchmaking expertise with a bold, contemporary design, making it a worthy addition to the Master Ultra Thin collection.

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About the Author / Author Expertis& Authority

John Biggs: I live in Brooklyn, NY and write about technology, security, gadgets, gear, wristwatches, and the Internet. After spending four years as an IT programmer, I switched gears and became a full-time journalist. My work has appeared in the New York Times, Laptop, PC Upgrade, Gizmodo, Men’s Health, InSync, Popular Science, and I’ve written a book called Marie Antoinette’s Watch about the most famous and mysterious watch ever made. I am the former East Coast Editor of