The unique middle watch case is cast from 904L stainless steel or 18ct gold with extremely strong corrosion resistance, and is equipped with an integrated crown shoulder pad. The triangular pit bottom cover is tightened with special tools by Rolex watchmakers to completely seal the case. The crown of the upper linked list adopts the patented three-button lock waterproof system and is firmly screwed on the watchcase to seal the door of a submarine. Rolex Submariner Date 116618LB VR Factory 18K Yellow Gold Wrapped Blue Dial Replica Watch. The mirror is made of scratch-resistant blue crystal. Chromalight display on the dial ensures that the wearer can read clearly in a dark environment. In the same brightness environment, the blue light can last for 8 hours, twice as long as the ordinary luminous materials. Luminous function Even in dark environment, luminous materials marked with zero position can still ensure clear reading. Oyster case is 300 meters waterproof, providing the best protection for highly precise movement from water, dust, pressure and impact. Solid link oyster gold strap.