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This second is an historical catalogue retracing all the history and the models created by Bell & Ross in order to share the vision of Bell & Ross and its collections from a chronological point of view. The iconography immerses followers into the world of Bell & Ross and the three areas dear to the brand: air, this calibre has a hairspring with a Breguet overcoil. The difference between a regular (flat) hairspring and a Breguet overcoil is that the terminal curve is bent upwards above the plane of the rest of the spring Although not as dedicate as the authentic one.