[sudb]

This reminded of this other clock project: https://mitxela.com/projects/precision_clock_mk_iv

Also: I reckon the closest best-value watch alternative that ticks most(?) of the author's boxes is the Casio GW-M5610-1ER, so long as you are inside a radio-controlled time area.

[MetaWhirledPeas]

Casio also has cheaper "wave ceptor" models that do this. If you get one from Japan you can get a nice-looking rectangular model.

[sudb]

I mentioned this specific model because it also has Tough Solar which should mean much longer between battery replacements!