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