HealthyPi Move: An Upcoming Open-Source Smartwatch
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https://linuxgizmos.com/healthypi-move-an-upcoming-open-source-smartwatch-powered-by-nordic-nrf5340-soc/
https://linuxgizmos.com/healthypi-move-an-upcoming-open-source-smartwatch-powered-by-nordic-nrf5340-soc/
PineTime 11mm
Samsung Galaxy Watch6 9mm
Apple Watch Series 9 10.7mm
Google Pixel Watch 2 12.3mm
Rolex Submariner (non-smart) 13mm