SMA-Q2 is a cheap chinese smartwatch with very promising hardware – mainly a color memory LCD that is low power and sunlight-readable.
Of course the logical thing to do is to reverse-engineer the hardware and run custom firmware on it.
Follow the project on hackaday.io
https://hackaday.io/project/85463-color-open-source-smartwatch
Featured on
https://hackaday.com/2020/01/30/sma-q2-smart-watch-is-completely-hackable/