A. Lange & Sohne 109.021 Lange 1 Moonphase 38.5mm Mens Watch This version builds off the success of the Classic Lange 1 with an addition of the moonphase.Light Champagne Dial is made of solid silver, with applied Roman Numeral & Index markers. Small Seconds hand sub-dial located a the bottom right corner. The moonphase differs from traditonal monnphases which advance once a day - this moonphase is actually connected to the seconds hand & continuously advances to the tune of a full revolution per lunar cycle. Patented large double window date display located at the the top right, with a quick date-correction button located on the case edge at the 10 o'clock position. Luminous Hands & Markers. Power Reserve (Up/Down) Indicator located at the 3 o'clock position. The movement has 54 jewels & beats at 21,600 vph & features twin spring barrels giving the watch a power reserve of 72 hours (3 days).