Steel Rolex Oyster Perpetual Milgauss 116400. Case diameter 40mm water resistant to 100 meters. Automatic chronometer movement. Black dial with applied luminous orange hour markers and luminous hands, orange outer graduated numeral markers with orange lightning second sweep. Polished steel bezel. Steel Oyster lock bracelet. The Milgauss model is a very recent re-introduction of a model originally designed in the 1950`s in response to a demand for a Watch highly resistant to magnetic fields. The movement is protected by an inner antimagnetic protection up to 1,000 gauss. Box and papers dated December 2015. Our reference S21563.