The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani basic runs on provides a 55-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you may, mainly because it shows a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/