A. Lange & Söhne, model: 315.026, automatic mechanical movement, 18k white gold, 37MM • Dial: Silver-white solid silver dial, stick-shaped hour markers, Lange's signature large date window, small seconds sub-dial at 6 o 'clock, symmetrical and simple dial design • Movement: Lange's self-made L921.4 automatic winding movement, 378 components, 46-hour power reserve, frequency 21,600 vibrations per hour (3 Hz); Equipped with Lange's signature hand-polished techniques such as a platinum centrifugal block unidirectional rotor, German silver plates, and hand-engraved balance wheel plates, it also features a ZERO-RESET mechanism for more precise stop-second adjustment