The Oyster is the flagship model that Rolex once offered.
The first generation appeared in 1926 as the Oyster Octagon (Octagonal), which is very different from the later Oyster.
At the time, it adopted an epoch-making screw-in type back cover, crown, etc., and was overwhelmingly excellent in airtightness.
Therefore, it is resistant to water and dust, and can be said to be a legendary series that has greatly changed the history of wristwatches.
The name comes from the fact that it will not break even if it is submerged in water for a long time like an oyster.
6426, etc. are so-called typical Oysters, and the case is a little small at 34mm.
There are various sizes and designs, such as Big Oyster and Speed ​​King, so please look for your favorite one.