The dial is extremely complex. It starts from a white gold base to which a series of cut-outs are made to accommodate the double large date window presiding over the northern hemisphere, and the small seconds, power reserve indicator sub-dial and tourbillon in the southern zone. The central zone including the large date is engraved with a rhombiodal pattern repeated in relief (a small diamond within a diamond), all engraved by hand without mechanical aids. Inspired by diamond-shaped hour-markers, it requires great expertise to ensure uniformity of dimensions and angles. Surrounding this central space is a thin strip engraved in tremblage that runs around the entire edge, the same technique used for the contours of the date windows.
The outer part is darker grey, and houses the aforementioned diamond-shaped hour markers that complement the Roman numerals at the cardinal positions (except at 6 o’clock, a position occupied by the tourbillon). The entire dial is then coated with translucent enamel to add three-dimensionality and highlight the contrast between the various shades and sheens. The back of the dial must also be enamelled, otherwise the dial will be deformed. The grand feu enamel is fired in an oven at approximately 800°C.
There are few differences from the original Cabaret Tourbillon caliber, and it is only worth noting that it implements a non-indexed oscillating system with a Lange balance wheel.
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The stop seconds is a mechanism that allows the owner precise time synchronization. While relatively simple in a conventional watch, the fact that the balance wheel sits inside a rotating cage adds a tremendous complication. But Lange solved this problem with a very ingenious mechanism. Pulling the crown to set the time sets in motion a lever mechanism that pivots a movable Y-shaped spring on the rim of the balance wheel. The balance wheel stops instantly, but if one arm of the lever is blocked by a cage component, the lever moves on its pivot so that the other arm can reach out and stop the balance wheel.
The geometry of the spring ensures that the pressure on the balance is always correct, regardless of the position of the tourbillon cage. In addition, this architecture conserves the potential energy of the balance so that the balance can be instantly reset as soon as the crown is returned to its initial position.