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I don't really understand why you wrote that it was a "coincidence". I was deliberately looking for a watch that looks good and uses an NRF52 chip. I don't think - although I could be wrong - that the Bangle JS 3 project has a budget for its own design. What I like about Gordon's projects is that they are rationally planned. Besides all that, really thanks for the info!
Geza-
I don't really understand why you wrote that it was a "coincidence"
You randomly found a watch that you like. This exact watch is one of the very few that already can run Espruino. That means someone wrote support for most/all the hardware inside, figured out and documented installation procedure and made usable build for you. That looks like quite a coincidence to me.
And BTW 99% of NRF52 watches cannot be updated with custom firmware without taking them apart because the firmware is signed by private key of the manufacturer and the device update won't accept any other. Da Fit - mobile app+watch firmware made by Moyoung company is rare exception. Bangle2 hardware is rare exception too with SWD pins on charging connector allowing custom firmware installation too.
fanoush
Yes, what a coincidence :-) More info e.g. here https://github.com/jeffmer/WatchApps#rock-and-magic3 But of course as unofficial port it is not properly maintained and currently it is outdated and only some subset of apps work. However with some effort it could be usable. You get what you pay for :-)