My brother in law is an engineer who makes tiny gadgets, and models of enormous insects. He once made a tiny robot snake that you could drive inside a drainpipe. He even gets paid to do it.
We often talk about watches and he has an idea to make a watch movement that tells the 'approximate' time, it would ultimately be accurate over the course of an hour or 12 hours, but the idea is that it is designed to speed up and then slow down, not massively, but enough so that the time is generally a little bit out, maybe using oval gears. I think it comes from living in the west country, where times are always approximate anyway. Try arranging a business meeting from someone from the south west and they'll generally be late. Or early if there's food.
I think we can sometimes get obsessed by chronometers and COSC accuracy, but wouldn't it be nice to kick back, and when someone asks you the time, you could tell them 'it's about two thirty, ish'? Does it need to be more accurate than this, 90% of the time?
Or not? Would you compensate for the error, and plot the differences on a chart, so you could correct it?
Is the 'approximate time' watch a dead duck or a clever beast?