Hermès watches presents a new perpetual calendar watch collection designed to capture the refined taste and impeccable aesthetics of the French Maison's soul. Called Slim d'Hermès, the men's watch collection was five years in the making and designed by Philippe Delhotal, creative director of Hermès, who was keen to respect the tenets of purity, sobriety and harmony. The Slim d'Hermès Perpetual Calendar is a triumph of design with its airy, light numerals and elegant arrangement of the watch's functions on the dial. As a perpetual calendar, the watch counts off the days, months and leap years, and even features a lovely Moon phase display in milky white mother-of-pearl with an aventurine glass sky. The 39.5mm rose gold case houses a new ultra-thin automatic calibre that measures just 2.6mm, which you can admire through the sapphire crystal caseback.