Patek Philippe Nautilus ref. 5712 in stainless steel with a custom black PVD coating. This watch features a factory blue dial, sapphire glass, bracelet with fold over clasp, sapphire case back and it's powered by an automatic movement with date, moonphase and power reserve function.
PVD coatings are thin film coatings where a solid material is vaporized in a vacuum chamber and deposited onto a target material, in this case the stainless steel of the watch. It is used to change the surface properties of the object to be coated, where new mechanical, chemical, electrical or optical characteristics are needed. PVD watches are very durable, more resistant to scratches and aesthetically attractive and unique.