The automatic COSC-certified PF441 chronometer motion that this Parmigiani vintage operates on provides a 55-hour electricity reserve, owing to its oscillating mass, and that is in delicately engraved gold, and can be admired from the sapphire crystal caseback. And admire it you may, as it shows some of the very https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/