Noticeable with the caseback, the oscillating mass in the movement is delicately engraved. It is actually constructed from 18-karat gold and decorated by hand by using a barley grain sample, carried out by guilloche Brief Acquire: This is Piaget at its very best. As I wrote inside our GPHG preview, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/