An upcoming Samsung smartwatch with the model number SM-R830 has been approved by the US Federal Communications Commission (FCC). This registration shows that the watch has a 40mm variant, and will come in stainless steel or aluminium casings. It also confirms that this device will not have the adjustable crown seen in earlier watches of this series.
https://www.notebookcheck.net/New-Samsung-Galaxy-Watch-gains-FCC-registration.428277.0.html