Jaeger LeCoultre, Master series, model: Q1613401, Manual mechanical, 18K white gold, Watch diameter: 40mm, manual mechanical, highly recognizable dial layout: The power reserve display at 10 o 'clock, the date display at 2 o 'clock, the day of the week and moon phase display on the left side, and the month display at the bottom, combined with a 40mm stainless steel case and diamond-encrusted hour markers, exude an elegant and high-end feel. The core function is a perpetual calendar, which can automatically identify large and small months as well as leap years without the need for manual date adjustment. It is paired with a moon phase display, maximizing both practicality and ornamental value. A perfect single watch, unrefurbished!! The corners are sharp, the movement is perfect, and it has rare diamond hour markers.