Although mechanism inside a Rolex was superb, poor sealing capability of contemporary watch cases meant dust and water would eventually get in and damage the mechanisms. Rolex addressed this issue in 1926 with the introduction of the Oyster case. The components of these cases were so finely put together that it meant that no dust or water can get in them. This case became the standard for all other watch cases and after the patents expired, all other watch manufacturer begun adopting it to their desing.
