This Montblanc 1858 Unveiled Secret Minerva Monopusher Chronograph reference 129613 is a limited edition of 58 pieces built around exposure rather than concealment. The point here is not simply a chronograph, but a monopusher chronograph whose mechanics are brought forward as part of the watch's identity. Its manual-wind movement suits that choice, keeping the interaction direct and the emphasis on the single-button chronograph layout that defines Minerva's appeal to informed collectors. In stainless steel, the case measures 43mm across and 14.18mm thick, a size that gives the architecture room without losing coherence on the wrist. The skeleton dial turns the movement side outward, so levers, bridges, and the chronograph display share the same plane. That reversal gives the watch a different kind of ownership interest, since what is usually hidden becomes the daily view. Within the modern 1858 line, it stands as a more technical reading of the Minerva monopusher chronograph than a conventional closed-dial execution.