Mercedes Gleitze Oyster watch patent
Mercedes Gleitze or Mercedes Carey (18 November 1900 – 9 February 1981) was a British professional swimmer. She was the first person to swim the Straits of Gibraltar and the first British woman to swim the English channel. The name of Mercedes Gleitze was used to market Rolex's new diving watch, "Oyster". This is the watch where Mercedes Gleitze used when swimming across the English Channel.
Similar watch from the era