The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani vintage operates on provides a fifty five-hour electric power reserve, owing to its oscillating mass, which is in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you may, since it shows a lot of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/