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the tinkering
I'd already come across the light spreader available for F91Ws and similar, which @oat44 linked above (wish I could get one to suit my DB-380), but one of the replies to that linked post blew my mind.
Take a water resistant watch, fill it with oil, and it's good for a kilometre underwater.
Mad. But, of course - one of those forehead smackers.
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I'd rather like one of the old Casio solar watches - nostalgic reasons - I think it's the AL180 but in black not silver, struggling to ID the right model.
Have you looked on here? https://www.digital-watch.com/DWL/categorylisting/all/solar/releasedate/Solar
This thread is so much better than the main watch one, even down to the tinkering.
I'd rather like one of the old Casio solar watches - nostalgic reasons - I think it's the AL180 but in black not silver, struggling to ID the right model.