Casio has released analog watches that can use Bluetooth before. However, it claims that the most recent models with this feature are updated in that they stay connected to a phone on a more consistent basis. These new EDIFICE variants do so in order to maintain their accuracy regardless of where they are.
https://www.notebookcheck.net/Casio-s-latest-EDIFICE-watches-have-a-full-time-smartphone-link.456053.0.html