There are 4 Swiss watch-making brands and One German who are producing 100% in-house movements are Patek Philippe, Jaeger LeCoultre, Rolex, A. Lange & Sohne and Roger Dubuis. Since A Lange & Sohne is manufactured in Germany, we classify this a German Watch though its mother comany is Richemont, Swiss. Amongst these, Roger Dubuis has increased the number of watch production to nearly 5,000 pieces per year; whereas PP is producing 42,000 pieces per year and Vacheron Constantin is producing 25,000 pieces per year. Rolex may produce as many as 1,000,000 pieces a year. Ferrari produces about 6,000 cars a year, so we are even more exclusive than them! Therefore, Roger Dubuis timepieces remain very exclusive when compare to other watch brands like Patek Philippe and VC. So if you want to purchase a watch, you should consider that these are the key factor that the brand name would not be eroded by OEM their movement to some other body. As for Collector’s mindset, everything should be the maker’s original design and product, or better off..do not collect!