As of my last update in September 2021, Samsung had not released a circular smartwatch. Their current smartwatch lineup consists of the Galaxy Watch 3, Galaxy Watch Active 2, and the Galaxy Watch Active. All of these watches feature a round display, but they are not perfectly circular.

Please note that there may have been new product announcements or updates since my last knowledge update. You can check Samsung's official website or trusted technology news sources for the most current information on their smartwatch offerings.