Breitling watches are manufactured in Switzerland using Swiss components. Breitling manufactures two movements: the calibre B01 and calibre B04, a B01 with an added GMT module.[2]ETA and Valjoux are the primary suppliers of ébauches used in certain Breitling watches. The ébauches are completed in the Breitling Chronometrie Workshops before undergoing COSC(Contrôle Officiel Suisse des Chronomètres) certification.
Breitling developed the BR01 in 2009, a mechanical chronograph movement, which was used in the Breitling Chronomat 01, the first watch produced entirely by Breitling. The Chronomat has ever since used a Breitling in-house movement with the latest addition to the range in 2012 being the Breitling Chronomat GMT Limited, a limited edition timepiece; and the Breitling Chronomat 44 GMT, both with the Breitling calibre B04 movement
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