Starfield Collectors Edition watch runs Espruino

Thanks @fanoush! Unfortunately that PCB looks quite different. I'm reasonably sure that the code on the PCB (RT-H120D) is pretty much the same on this other watch (maybe it'd RT-H120 or something like that).

do you think there is much of a chance that the dickens watch was more original then we thought?

As far as I'm aware, it's not really. I think it was a standard-ish board (that maybe had some slight mods because of the component shortage) and probably a custom flex PCB for the buttons.

But that probably doesn't matter - I think Richtechie re-use a lot of designs, so all you really need is a Richtechie-based watch with a heart rate monitor, and they will likely gave used a flex PCB for the HRM with the same FPC connector, and then you could work from there.

I know DT No. 1 (who made the original Bangle.js 1) did use Richtechie boards (the Bangle.js 1 was one of them) so I guess they might be a good place to start?

In the Dickens.py the package is shown as QFN48 but its actually the aQFN73

I wouldn't put any weight on that - that field isn't used for anything other that board docs so it likely wasn't updated.

I should be able to have a javascript app access i2c without having to do anything fancy so I can defo do this project.

Yes, absolutely - really all you need is two spare pins for I2C and you'll be fine