A few days ago I put up a video showing how Patek Philippe's 175th anniversary watch was made. At over US $2.6 million, I doubt whether any of my readers will be buying one out of petty cash . . . Be that as it may, the video displayed the exquisite craftsmanship that goes into such watches.
Here's another, shorter example of craftsmanship from Nomos Glashütte, a relative newcomer to the field of watchmaking. View it in full-screen mode to see more of the details.
You'll find more of their videos on the company's YouTube channel.
I don't think I'd have the patience (or the dexterity) to work at such microminiature sizes . . . but I have to admit, the result is impressive - and their prices are several orders of magnitude more affordable! (No, that's not an advertisement for them - merely an observation.)