The TicWatch Pro 3 4G/LTE is a 2020 dual-display smartwatch with standalone cellular connectivity. It is now on sale in Europe, although it is only usable through 1 carrier in the UK, Spain and Germany thus far. It is available on Amazon in these countries from now.
https://www.notebookcheck.net/Mobvoi-unleashes-the-TicWatch-Pro-3-4G-LTE-on-the-European-market.507241.0.html