The automatic COSC-certified PF441 chronometer movement that this Parmigiani basic operates on offers a fifty five-hour electricity reserve, owing to its oscillating mass, which is in delicately engraved gold, and can be admired through the sapphire crystal caseback. And admire it you can, since it displays several of the best https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/