A. Lange & Söhne | Saxony series, model: 307.029 automatic mechanical 40.6mm 18k white gold single watch. The watch in the picture is a Lange Saxony series dress watch with a three-hand small seconds dial. Core visual features: 1. Case: Made of 18K white gold, with a diameter of 40.6mm and a thickness of only 8.2mm, it is an ultra-thin business size. The crown is Lange's signature concave and convex textured onion-shaped crown. 2. Dial: Matte black dial, three-dimensional bar-shaped hour markers, slender blue steel hour and minute hands, independent small seconds sub-dial at 6 o 'clock, minimalist German-style symmetrical layout, printed with the brand's origin "GLASHUTTE I / SA". 3. Strap: Black matte alligator leather strap with 18K white gold pin buckle. 4. Water resistance: 30-meter water resistance for daily use, suitable only for daily wear, not for swimming..."