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Dating a vintage Breitling wristwatch is much easier than a Rolex or Tudor as the serial number is most commonly stamped either on the outside or inside of caseback. The table below summarizes the serial range for watches from 1944-1978. In 1978 the serial numbers underwent a change whereby they were specifically assigned in accordance to specific models, as appose to the older system of having sequential numbers used to date all models (from 1944-1978)