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The creation of a watch that, for all intents link and purposes, could handle pretty much anything that modern recreational diving could throw at link it came along surprisingly early. Rolex produced its first Oyster case in 1926, and link Mercedes Gleitze wore one during an attempted cross-Channel swim in 1927, although the inspiration for the Oyster case wasn't the creation of a dive watch, per se. Still, ten hours of more or less constant immersion is pretty impressive.