The Blancpain Villeret ref: 6659-3631-55B features a 42mm case crafted from rose gold. This timepiece is powered by the automatic winding Blancpain caliber 5939A, which was introduced in 2014. It showcases a white dial with a perpetual calendar function, displaying the date, month, and leap year. Additionally, the watch includes a moonphase complication, providing a comprehensive view of lunar cycles. The combination of these features makes it a sophisticated choice for those who appreciate intricate watchmaking.