Discover Jaeger-LeCoultre's precision with the Master Ultra Thin (ref. 1278420), a refined timepiece that blends thoughtful design with reliable performance. A study in proportion and durability: crafted in stainless steel and measuring 38.5 mm in diameter, with a thickness of 7.6 mm, defined by a round silhouette, paired with a gem-set bezel. The caseback is open, and the crystal is sapphire, delivering water resistance to 5000 meters. The dial composition is deliberate and legible: a silver tone with sunburst finish, framed by stick / dot hour markers, and dauphine hands. Beneath the caseback lies dependable performance: the 896 caliber. Introduced in 2014. Comfort and balance define the wearing experience, making it an easy daily companion. Subtle transitions between textures elevate the overall impression. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.