Experience the craft of Jaeger-LeCoultre in the Master Ultra Thin (ref. 1338421), a contemporary classic shaped by careful watchmaking know-how. The exterior is thoughtfully executed: crafted in stainless steel and measuring 41 mm in diameter, with a thickness of 7.5 mm, defined by a round silhouette. The caseback is open, and the crystal is sapphire, delivering water resistance to 5000 meters. At a glance, the dial balances texture and clarity: a silver tone with sunburst finish, framed by stick / dot hour markers, and dauphine hands. At its heart beats a proven engine: the 898C caliber. First released in 2013. With considered ergonomics, it feels composed during extended wear. Brushed and polished elements play with light to emphasize crisp geometry. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.