Jaeger-lecoultre, "Crystal Gong" Minute Repeater from the Exceptional Watchmaking Craftsmanship series, Model: Q1642450, with a diameter of 45mm and made of 18K rose gold, features an exquisite mechanical design with a skeletonized movement. It has a 15-day power reserve and a mainspring barrel torque display function. It is equipped with the minute repeater, which is the most complex function among the three major watch complications. The sound produced by the crystal gong of the minute repeater slider is clear and pleasant. Limited to 175 pieces worldwide.