Piaget Altiplano watch, 41 mm. Case in 18K rose gold. Sapphire crystal case back. The world's thinnest chronograph watch with hand-wound mechanical movement (8.24 mm thick). The world's thinnest ultra-thin mechanical chronograph movement (4.65 mm thick), the Manufacture Piaget 883P hand-wound caliber has small seconds and chronograph flyback functions and a dual time zone display.