If my son were a watch, he might not be Swiss. No, that is not the caption to a Surrealist painting. Let me explain.
My son is Anglo-Swiss, born to a Swiss woman and her British husband (me), and holds passports to both countries. In other words, he is 50% Swiss, and that makes him all Swiss. A not-dissimilar legal privilege is extended to Swiss watches, which can only claim the celebrated tag "Made in Switzerland" if at least 50% of their production costs are incurred in the country.