From Federation of the Swiss Watch Industry: COSC Certificates in 2006 (September 18, 2007) Last year, the Contrôle officiel suisse des chronomètres (COSC) issued 1,300,140 certificates, or 10.7% more than in 2005. The number of registered pieces rose by ...
Of the brands listed, Chopard is 100% in-house and non-ETA, so is Zenith. Ebel and UN do use ETA ebauches, but some of their movements are in-house as well. Of course officially a good number of Omega movements are "in-house" too. - SJX