Authenticity: The Rolex Cosmograph Daytona DiW 40mm is a uniquely customized timepiece that blends the classic sophistication of the Daytona with cutting-edge design innovations from DiW. Each piece showcases a bespoke carbon fiber case and unique dial accents, marking a union of luxury and distinctiveness. Warranty: DiW custom watches typically extend a warranty on the customization work. Please inquire specifically regarding DiW offerings for detailed warranty information in addition to Rolex’s standard service coverage.