The automated COSC-Qualified PF441 chronometer motion that this Parmigiani typical operates on provides a 55-hour electricity reserve, owing to its oscillating mass, which is in delicately engraved gold, and can be admired throughout the sapphire crystal caseback. And admire it you may, as it displays some of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/