Jaeger-LeCoultre Master Calendar Q4128421 Watch

Founded in 1833 in the Vallée de Joux, Jaeger-LeCoultre is celebrated for its in-house innovation, technical excellence, and refined watchmaking. The Master Control collection, introduced in 1992, reflects the brand’s commitment to precision and understated elegance, with every timepiece undergoing the rigorous 1,000 Hours Control testing programme to ensure accuracy, reliability, and durability. The Master Control Geographic is a signature traveller’s complication, combining world time and dual time functionality within a clean, highly legible dial design. This reference Q4128421 features a 40mm stainless steel case with sapphire crystal front and exhibition caseback, paired with a black alligator leather strap and stainless steel folding clasp. It is powered by the in-house automatic Jaeger-LeCoultre Calibre 939, operating at 28,800 vibrations per hour (4 Hz) with an approximate 70-hour power reserve. The dial is silver sunray with applied hour markers, a world time city disc, second time zone sub-dial with 24-hour day/night indicator, and date display. Functions include hours, minutes, central seconds, second time zone, world time, and date. The watch offers 50 metres (5 bar) water resistance and is certified under the 1,000 Hours Control programme. The Master Control Geographic combines practical travel complications with timeless design, making it a refined and versatile companion for the modern wearer.