Someone in this forum,
http://www.sg-roc.com/showthread.php?t=11853&page=9, mentioned that and I quote
Even Rolex SA do not & has never claim in-house horlogerie manufacturer.
The links or bracelets for Rolex are made by ARTeLinks.
Hands & dials for Rolex are outsourced to ArTeCad.
Steel case for Rolex watches are made by SWATCH group
Rolex movements are made by Valjoux's secret assembly division that's protected under Swiss law & it's ebouche are loosely implemented by Dubuis Depraz.
Diamonds for Rolex are cut and polished by
FYI, ARTeLinks, ArTeCad, Valjoux & Dubuis Depraz are owned by SWATCH and shared by LVMH, Richemont & many others in a secret deal chaired by Swiss govt since 1997.
End of quote.
I always thought that Rolex was like 90% in-house watch. How many of you share the same thought as I am?

Looks like Rolex also uses "ETA" ebauche after all ... a more secretive Valjoux ebauche hahahha