Oyster perpetual. Sea dweller. 4000. With box. Real nice watch. Case unidirectional. Rotatable. Bezel. With black cerachrom insert in ceramic. Helium. Escape valve. Trip lock. Winding. Crown with triple water proof nests. System. Movement mechanical self winding. Instantaneous. Date with rapid setting paramagnetic blue parachrom hairspring bracelet. Oyster oyster lock safety clasp with glide lock extension system flip lock extension link real nice watch. It's a. Triple aaa. You can't get better. Mark up in all places. Even inside face and on back. You won't tell the deference believe me. Proper deal not cheap rubbish. bargain £150. Yes. £150. Check it out bargain First to see will buy