There is a common misconception that the Rolex Turn-o-Graph preceded the Submariner and was presented in 1953. In reality, the Submainer was produced before the Turn-o-Graph (2.53 vs. IV.53). The first batches of both models have case numbers in the 949,xxx range but the Turn-o-Graph's are slightly later. Both models were presented at the Basel Watch Fair in 1954, together with the Rolex Explorer.
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Jose