The Master Ultra-Thin series by Jaeger-LeCoultre epitomizes sleek design. Positioned as an understated dress watch, its ultra-thin construction doesn’t aim to set records but rather serves as a comfortable and sophisticated classic timepiece that seamlessly fits under a cuff. Launched in 2008, the Master Collection highlights Jaeger-LeCoultre’s remarkable expertise in crafting classic complications, boasting more movements in its archives than any other brand. In 2012, the Master Ultra-Thin designation was introduced to signify the brand’s proficiency in creating slim complications suitable for elegant dress watches, and in 2017, the Master Ultra-Thin Power Reserve complication debuted in both gold and steel models.
This year, the timepiece undergoes refinements to enhance power and update the dial. While the automatic caliber 938 movement was present in the previous model, it has now been upgraded to extend the power reserve to an impressive 70 hours, a significant increase from the previous 43 hours. Notably, this boost in power was achieved without altering the size of the movement, which remains at a slim 4.9 mm (the case dimensions are a modest 39 mm wide x 8.95 mm thick). The redesign of the mainspring barrel and the incorporation of silicon components contribute to smoother energy transmission, reducing friction during operation. The movement evolves from Jaeger-LeCoultre’s caliber 481, also known as the Powermatic, dating back to the 1940s, recognized as the world’s first self-winding timepiece with a power reserve gauge.
Beyond the power reserve indicator, the dial showcases date and cross-hair small-seconds subdials in a slightly asymmetrical layout, receiving updates. The subdials are enlarged for improved legibility, and the elongated hour markers create a slimmer appearance. Gold dots denote the minutes, providing a striking contrast against the brilliant midnight-blue sunray dial. The watch comes with a matching alligator strap. For those who enjoy manual winding, observing the movement of the power reserve indicator adds a delightful touch, especially during mundane meetings. Inspired by the design of Jaeger-LeCoultre’s first ultra-thin pocket watch from 1907, the 18-karat rose gold case complements the overall aesthetic. The new Master Ultra-Thin Power Reserve is available at a price of $21,200.