For SIHH 2019 the refined and elegant horology brand Jaeger-LeCoultre has chosen to update one of its most popular models, the “Master Ultra Thin”. This new limited edition “JLC Master Ultra Thin Moon Enamel” has been crafted with a stunning blue enamel dial and equipped with an improved novel in-house mechanical movement. Their new CEO Catherine Rénier seems to be on the right track with these profound yet refined updates to classic timepieces in the JLC catalog.


The 39mm case is made of 18k white gold with a transparent sapphire exhibition case back, which allows to view the inner workings of the mechanical movement. It is slightly thicker than the standard “Master Ultra-Thin Moon” at 10.04mm versus 9.9.


This minor size increment may be due to the altered dial or housing the updated movement, Jaeger-LeCoultre caliber 925/2, which is a great improvement that offers a power reserve of 70-hours versus the previous 43-hour capacity.


But, despite its “enlarged” diameter it is still barely a hair thicker than its previous incarnation and continues to deserve its title of “ultra-thin”. It also comes equipped with a setting-crown and a small correction push-piece, aligned on the case at the 4 o’clock positon, which is used to modify the Moonphase when need be. All topped by a sapphire crystal that assists with water-resistance on this watch being able to reach up to 50 meters (164 feet).


Time is exhibited on a blue guilloché pattern dial with a metallic base and translucent blue enamel. It has long-tipped 18k white gold applique hour markers, which are doubled at the 3, 6, 9 and 12 o’clock positions; while farther out on the inner flange is a ring of small dotted minute index markers.

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The expertise of the Jaeger-LeCoultre master watchmakers is truly highlighted on this dial. They have redesigned the 20-year old classic “Master Ultra-Thin” model with painstaking attention to detail. Artistically meshed in its captivating blue dial are geometric motifs, which effectively supply the characteristic effect associated to the traditional decorative technique known as guillochage. One must recall the brittle sensitive quality of the blue enamel layer, require extreme precision and consistent controlled pressure to avoid any cracking.


Laid over this captivating blue backdrop is an 18k white gold date-track sub-dial with raised art deco style numerals and a frosted finish at the 6 o’clock position; which includes a Moonphase and sub-seconds in its midst. Its mirror-polished moon also features an updated design, which provides a shiny presence when a full moon comes around.


The high polished 18k white dauphine-style hands have also been slightly nuanced and elegantly modified from previous JLC Master models, now appearing in a slightly thinner and more elongated design.


Jaeger-LeCoultre Master Ultra-Thin Moon Enamel

This “Jaeger-LeCoultre Master Ultra Thin Moon Enamel” (Ref#: Q13635E1) is powered by a self-winding mechanical movement, caliber 925/2 with 38 jewels, 246 components and 28,800 Vph. Power reserve on this watch can last up to 70 hours, when fully wound. It comes equipped with blued screws and decorated with Geneva stripes and a perlage finish.


Mounted to the watch is a blue alligator strap with exposed matching stitching, while secured to the wrist by an 18k white gold pin buckle. This is a limited edition of only 100 manufactured pieces. For more up to date information visit the official Jaeger-LeCoultre website here.


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Written by Mauro Az