Sixth model of LANGE 1 MOON PHASE “25th Anniversary”

To mark the occasion of the 25th anniversary of the LANGE 1, A. Lange & Söhne is presenting in an exclusive 25-watch limited edition in white gold with blued steel hands.
The moon stands out especially in the dark. By day, the sun usually outshines it, but even then, it accompanies us. The LANGE 1 MOON PHASE makes that visible. During the daytime, the moon is depicted against a bright blue starless sky; at night, it contrasts against the dark blue heavens with 383 sparkling stars. Thus, the moon always shows itself against a realistic background that doubles as a day/night indicator. This makes it easier to set the time because it assures that the date switches at midnight and not, inadvertently, at 12 noon.
The combination of the moon-phase display with a day/night indicator has two layers. It consists of a solid-gold celestial disc with blue gradation. The disc completes one full revolution about its own axis every 24 hours, mapping the rhythm of day and night. Against this background, the white-gold moon performs its synodic orbit in 29 days, 12 hours, 44 minutes, and 3 seconds with such precision that it takes 122.6 years before a correction by one day is needed.
An exciting interplay of silvery and blue hues unfolds on the asymmetrical, argenté-colored dial. The thermally blued steel hands and the color-matched inscriptions harmonize with the gradated blue tones of the celestial disc. The watch features a blue alligator leather strap with a solid white-gold prong buckle.
Finished to the strictest Lange quality standards, the manually wound calibre L121.3. The 70 additional parts for the moon-phase display and the day/night indicator were integrated in the movement so compactly that the watch is only 0.4 millimetres thicker and has an unchanged diameter of 38.5 millimetres. It continues to stand out with the same technical features. They include a twin mainspring barrel with a power reserve of 72 hours, a power-reserve indicator with the UP/DOWN inscription and a precisely jumping outsize date display. The escapement, consisting of a cam-poised balance and a freely oscillating Lange balance spring, runs at a frequency of 21,600 semi-oscillations per hour.