551P

The Manufacture Piaget 551P is a truncated round, self-winding mechanical movement featuring hours, minutes, small seconds at 10 o'clock, and a power-reserve indicator at 6 o'clock. It runs at 21,600 vph (3 Hz) with a 42-hour power reserve, measuring 20.5 mm by 4.9 mm. This 225-component caliber uses 27 jewels and is finished with circular Côtes de Genève, bevelled bridges, a circular-grained mainplate, and blued screws.