Sell Watches Boca Raton COSC, more formally known as Contrôle Officiel Suisse des Chronomètres, is the official certification company of Switzerland. There job is to test watch movements in different positions and different temperatures over a period of 16 days. The movement must perform within a certain margin for error otherwise the watch will not be… Continue reading Top Chronometer Brands – Sell Watches Boca Raton
