Hm, googling didn't find it, nor did a Google image search. But Yandex's image search is way better...
Behold, the F-91 Kepler:
https://www.hackster.io/news/pegor-s-f91-kepler-is-a-work-in-progress-open-hardware-smartwatch-reboot-of-casio-s-classic-f-91w-b4726119ca89
Sadly, seems to be stalled: https://gitlab.com/_Pegor/kepler_fw
I did find this, though... https://www.crowdsupply.com/oddly-specific-objects/sensor-watch
Ordered.
I mentioned the Sensor Watch upthread. Great for sensor projects. It seems like with most of these bigger mods that battery life suffers too much.
@psg1ben started
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Hm, googling didn't find it, nor did a Google image search. But Yandex's image search is way better...
Behold, the F-91 Kepler:

https://www.hackster.io/news/pegor-s-f91-kepler-is-a-work-in-progress-open-hardware-smartwatch-reboot-of-casio-s-classic-f-91w-b4726119ca89
Sadly, seems to be stalled: https://gitlab.com/_Pegor/kepler_fw
I did find this, though...
https://www.crowdsupply.com/oddly-specific-objects/sensor-watch
Ordered.