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