The RICHARD LANGE PERPETUAL CALENDAR “Terraluna” is a horological masterpiece that combines A. Lange & Söhne’s benchmark precision, inventiveness, and design competence. Featuring an orbital moon-phase display, a perpetual calendar with the Lange outsize date, a power-reserve of 14 days, and a constant-force escapement, this extraordinary time-keeping instrument represents the pinnacle of Saxon watchmaking artistry.