Rolex Cosmograph Daytona Steel Rolesor - Black 126503Overview The 126503 occupies the Rolesor position in the steel Daytona lineup Oystersteel case with 18k yellow gold tachymeter bezel, gold sub dial rings, and gold hour markers. The two tone configuration has a long history in the Daytona family, traceable to the original yellow goldbezel references of the Zenith movement era. The case is 40mm Oystersteel with an 18k yellow gold tachymeter bezel and polished gold ring at the outer edge. The dial is