ROLEX OYSTER PERPETUAL TWO TONE WRISTWATCH: 18K yellow gold and stainless steel date just watch with stainless steel case. Case number 16233. Serial number R715838. The bezel and genuine Rolex crown are 18K. Dial with standard Radium stick style hands. 31 jewel movement, caliber 3135, serial number 5179479, automatic winding, sapphire crystal with nicks. In good running order, passed water resistance test.