Piaget's latest top-level real flywheel case: 40mm diameter, polished by CNC top technology, the case and literal are covered with 18K gold processing, never fade. The sapphire crystal surface has a blue coating. The penetrating effect makes it look more transparent. 18K gold-plated tourbillon manual winding movement, kinetic energy 120 hours. Waterproof: 50 kg vacuum waterproof test. Art, craftsmanship, high-end atmosphere, the best choice Piaget tourbillon.