Quite another ball game to run a fairly large firm with such relatively laege manufacturing output with such a consistent and high quality, compared with atelier/ small workshops. Quite an amazing feat. The difference between "prêt-à-porter" and "sur mesure". I imagine that the sur mesure and the prêt-à-porter at Patek amount to about 1 or 2/1000 of the manufactured output?
Best
Z'