The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani traditional operates on provides a 55-hour power reserve, owing to its oscillating mass, that is in delicately engraved gold, and may be admired in the sapphire crystal caseback. And admire it you are going to, as it shows a lot of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/