One of the first Rolex difficulties included consummating the chronometric accuracy developments of the organization's replica watches. The Official Watch Rating Center, situated in Bienne, granted Rolex the first Swiss Certificate of Chronometric Precision in 1910.Rolex proceeded with its journey for brilliance and earned the class "An" accuracy endorsement in 1914, granted by Kew Observatory of Great Britain. Getting this honor was a defining moment for Rolex, which from there on wound up eminent for its accuracy watch developments.