MPOW/Desay DS-D6 - $9.99 nRF52832

[fanoush]

Hi, you have a nice set of watches and shopping links there! :-)

You may add MPOW/Desay DS-D6 there too. It is nRF52832 based bracelet with BW OLED for ~$10. Gearbest sells it for more than year and it is often on sale for $9.99 (more often on sale than for regular price) and now it is even for less (lowest so far was $7.99)
https://www.gearbest.com/smart-watches/pp_1232618.html?wid=1433363

I am documenting reverse engineering effort here https://github.com/fanoush/ds-d6
Apart from the low price for full nRF52832 64/512 it is also good one because SWD pins are right under front glass so no need to remove anything except the glass and also the USB data pins on charging connector are connected to pin 22,23 so one can have serial console or more I/O without opening the watch! Also the flash was not protected so it is easy to backup.

Also the band design hides the body so it looks good even after reattaching glass and possibly one can also hide extra side button or something invisible connected to usb data pins there and still wear it.