This is an extremely rare early masterpiece of Lange - the first-generation watch of the 1815 series, model 206.027. Featuring a 36mm white gold case, it is comfortable to wear, has an elegant proportion, and every detail reflects the meticulousness and refinement of German watchmaking. The most eye-catching feature of this wristwatch lies in its deep blue brushed dial. The dial is rich in color, and when paired with a darker small seconds dial, it presents a charming transformation from black to precious blue under different lighting conditions, earning it the title of a rare configuration that collectors are eager to obtain.