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The extra-flat watch movement known as a Bagnolet is built in a particular way: the calibre is "inverted" so that the dial is on the gear train side rather than the bottom plate side. As a result, the gears turn in the opposite direction so that the time can be read correctly. The back of the bottom plate, visible when the watch base is open, is completely flat. The finished movement of the flattest Bagnolet watches is no more than a millimetre and a half thick.