Rolex Bi-metal Oyster Perpetual Datejust 16013. Automatic chronometer movement. 36mm case, diameter which is water resistant to 100 meters. Silver dial with index hour markers. Fluted bezel. Plexi glass. Bi-metal Jubilee bracelet with folding clasp. Box and papers dated May 1984. Service Papers dated June 2003 and January 2019.