The parts in expensive watches are huge by comparison with the parts in these kinds of electronic products. A tiny balance jewel might be 0.6mm in diameter. Th

The parts in expensive watches are huge by comparison with the parts in these kinds of electronic products. A tiny balance jewel might be 0.6mm in diameter. The smallest surface mount components are now (I think?) 0201 metric - i.e. 0.2mm x 0.1mm. Plus a balance jewel is not a two-terminal component that needs to be soldered in place.