Bi-Metal Rolex Oyster Perpetual Mid Size Datejust 178273. Case diameter 31mm. Water resistant to 100 meters. This watch is equipped with calibre 2235, a self-winding mechanical movement entirely developed and manufactured by Rolex. Featuring a Champagne dial with Diamond hour markers and Yellow gold fluted bezel. Bi-metal Jubilee bracelet with concealed crownclasp. Box and papers dated January 2017.