Steel Rolex Oyster Perpetual Milgauss 116400. Case diameter 40mm water resistant to 100 meters. Automatic chronometer movement. Black dial with applied luminous hour markers and luminous hands, orange outer graduated numeral markers with orange lightning second sweep. Polished steel bezel. Steel Oyster lock bracelet. Box and papers 2009. 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 highly resistant watch to anti-magnetic fields. The movement is protected by an inner antimagnetic protection up to 1,000 gauss. Our Reference S20487.