The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani traditional operates on provides a 55-hour electric power reserve, owing to its oscillating mass, which is in delicately engraved gold, and might be admired in the sapphire crystal caseback. And admire it you'll, as it displays several of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/