Rolex. A Stainless Steel Automatic Chronograph Wristwatch with Black Dial, Brown Color-Change Subsidiary Dials, Bracelet, Box and Original GuaranteeSigned Rolex, Oyster Perpetual, Superlative Chronometer, Officially Certified, Cosmograph Daytona, Ref. 16520, Case No. W623276, Manufactured in 1993Cal. 4030 automatic movement, 31 jewels, black dial, applied luminous baton numerals, luminous hands, three black subsidiary dials with brown color-change chapter rings for 12 hour and 30 minute registers and constant seconds, tonneau-shaped water-resistant-type case, blank bezel calibrated for 400 units per hour, two screw down chronograph buttons in the band, screw down crown, screw back, stainless steel Rolex Oyster bracelet, case, dial, and movement signed39mm diam.