Crafted entirely in-house, the Hermes Slim Quantieme Perpetuel inherits the sleek, minimalist lines of other Hermes Slim watches. The easily readable dial has silver-toned transferred numerals in a typography specially designed for the Slim series. It also has several subdials, giving the watch plenty of character, and is housed in a 39.5mm circular platinum case. The "Slim Quantieme Perpetuel Platinum" uses the extra-slim H1950 in-house movement. This mechanical automatic movement features a perpetual calendar function, an exceptional watchmaking complication that adjusts automatically for the varying length of the average 12 months (30 or 31 days), as well as leap years. The movement also has hours and minutes functions, a day/night indicator, a second time zone hour indicator and a moon phase window at three o' clock, featuring a mother-of-pearl moon on an aventurine sky.