Citizen Watch Calendrier Moonphase Ladies FD0004-51D. The Citizen Eco-Drive ladies' Calendrier Moonphase timepiece tracks moon phase movement alongside the time. Featuring a two-tone stainless steel bracelet and 37mm case, along with a mother-of-pearl three-hand dial, inset with diamonds for an elegant touch. It runs on Eco-Drive technology, meaning it is powered by light, blending elevated style and advanced features into one elegant package.