A. Lange & Söhne Richard Lange Perpetual Calendar "Terraluna"

The A. Lange & Söhne Richard Lange Perpetual Calendar "Terraluna", reference 180.026FE, has a perpetual calendar and a 45.5 mm case. The 18-carat white gold case is 16.5 mm high, has a see-through back and is water resistant to 30 metres. The dial is crafted from solid silver in a scientific-clock regulator design, with an outsize date, power-reserve indicator, day/night indicator and day-of-week display. An orbital moon-phase display occupies the movement side. Manual-winding calibre L096.1 contains 787 parts and has a 336-hour power reserve. The movement beats at 21,600 semi-oscillations per hour and has a constant-force escapement. A black alligator leather strap closes with an 18-carat white gold folding clasp.