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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, I think that's them. The model was the DO003 - looking on alibaba there are still loads for sale.
@MaBe has actually done a great watch-mountable case for Puck.js: https://www.thingiverse.com/thing:2095572
With one of the dark silicone cases and a small OLED screen you could probably come up with something quite neat. I've been quite tempted to try.
Puck.js was quite a reach for me with two separate moulded cases - I think it'd be a step too far trying to make a whole watch! Having said that I did try and talk to the watch manufacturers at the time I was hacking it - I think if I got a big enough order I could convince them to install custom firmware (or at the very least give me the encryption key for their bootloader), so that could definitely be an option.
I think it'd still be a matter of reverse engineering though - they didn't want to give me any schematics :)