Referred from Rolex Official Website: "Cosmograph Daytona Oyster, 40 mm, Oystersteel and yellow gold Reference 126503
This Oyster Perpetual Cosmograph Daytona in Oystersteel and yellow gold, with a bright black and golden, diamond-set dial and an Oyster bracelet, features a yellow gold bezel with an engraved tachymetric scale."
