The Datejust of course was housed in an Oyster case, another great Rolex innovation. Ireplica rolex datejust watches n 1926, the Oyster case became the very first waterproof wristwatch case to be produced serially and it was also the first fully-integrated waterproof case overall. Previously, any waterproof cases were tedious affairs that involved an outer case being snapped over the main case.
We also had the Perpetual rotor that would automatically wind the movement, one of the few innovations not achieved first by Rolex. Harwood beat them to market by 3 years, offering up the first automatic movements in 1928. The Datejust also had the new bracelet mentioned before, the Jubilee bracelet. Originally, Jubilee was considered for the name of the watch itself, replica rolex watches but it ended up just on the fine-linked bracelet that we still have today.