Referred from Rolex Official Website: "Cosmograph Daytona Oyster, 40 mm, Oystersteel and yellow gold Reference 126503
The Oyster Perpetual Cosmograph Daytona in Oystersteel and yellow gold with a black dial and contrasting counter rings. It features an Oyster bracelet and a yellow gold bezel with an engraved tachymetric scale."
