The moon phase is one of the most poetic watch complications, and Patek Philippe has incorporated it into the new Calatrava Ref.7121 beautifully. Elegant and refined, this sparkling newcomer bears the classic round case that distinguishes all Patek's Calatrava watches, crafted from expertly polished yellow gold. The applied gold numerals and hands gleam on the cream-coloured dial, encircled by 66 flawless brilliant-cut diamonds around the bezel. The wearer can monitor the phases of our nearest celestial neighbour via the moon phase aperture at 6 o'clock, which is powered by the manually wound caliber 215 PS LU movement. This new Patek moon phase movement is so accurate that a single day's adjustment is required only once every 122 years.