Easy
All you have to do is sell great watches and 20% of the MSRP (or 80% off of MSRP). Start with Patek, AP ROO line, and nice pieces by VC, Lange, FPJ, and GO.
Once you keep doing it for few years you will establish enough clientele for your list and if you’ll still have some funds left, you can start selling other brands… .
don't try it at home....
Happy new year
T.