The automatic COSC-certified PF441 chronometer motion that this Parmigiani common runs on provides a fifty five-hour electrical power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you can, since it displays many of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/