[1] This model! https://www.fratellowatches.com/citizen-homer-second-setting...
It’s not likely to employ millions of people, but there will be demand from people with serious money. For instrument making, research labs will need specialized glass parts, for example; for painting maintenance, museums have a need to keep their centuries-old pieces in the best condition. For watches, if you pay a few million for a watch, paying 10k a year for maintenance should not be a problem. For that money, you can make a decent living of 20 customers a year in many countries.
As someone in love with fountain pens and ink, I can tell you that there are absolutely wealthy pen turners, private designers, and the same with watches.
I don't have the socials, so I don't see things like what you mentioned.
Watchmaking can take a heavy toll on eyesight, due to working with magnifying glasses on tiny parts during decades. Also each brand has unique processes and machinery, for which they have expensive learning courses.
Thus they would rarely consider applicants past their forties even if they have experience and favorable relations.
probably would make more $ from it if you were a YouTuber or TikTok creator and did "watchmaking" content.