The Montblanc Star Collection watches feature round cases, black Arabic numerals and rich finishes in the tradition of Haute Horlogerie. All of these characteristics are expressed in the new Montblanc Star Twin Moonphase.
Its automatic Montblanc calibre MB 29.13 was constructed for a new type of complication that is used exclusively by Montblanc and gives the watch its name: a moon-phase display that shows the moon’s phases in both the Northern and Southern hemispheres and the age of the moon in days.
The moon’s phases appear differently depending upon whether they’re observed from the Northern or the Southern Hemisphere. The lunar phases follow one another in the same sequence regardless of an observer’s location: full moon is full moon and waxing moon is waxing moon, but the geometries of the waxing and waning moon as seen from the Southern Hemisphere are mirror images of their counterparts as viewed from the North. The waxing moon’s crescent always appears to curve toward the right when seen by an observer in the Northern Hemisphere, but curves toward the left when viewed from the South.
Most timepieces with moon-phase displays depict only the lunar phases as they appear to observers in the North. But not the Montblanc Star Twin Moonphase, which also does justice to the perspective of people who dwell in the Southern Hemisphere.
A classical moon-phase display with its characteristically shaped window is combined here with a pointer for the moon’s age in days. This slim hand is positioned diametrically opposite the conventional moon-phase display in the lower half of the lunar subdial, where it points to symbols that show the appearance which the moon’s phases present to viewers in the Southern Hemisphere.
All this takes place at “6 o’clock” on a classical subdial. The moon’s age is shown in days along the periphery of the subdial, the upper portion is reserved for a familiar moon-phase display with a characteristically shaped window in which golden-coloured Luna glides above a dark blue background and gradually changes her appearance to keep pace with the phases of the moon as seen by observers in the Northern Hemisphere. The surface below it is adorned with a pattern shaped like Montblanc’s emblem and wreathed by moon-phase symbols as they appear in the sky above the Southern Hemisphere.
The dial is adorned with a fine guilloche décor. This continues to the clearly structured scale for the minutes and seconds along the outermost periphery of the dial. The scale has an aperture between “one o’clock” and “two o’clock” for the asymmetrically arranged pointer date, as well as a cartouche at “10 o’clock” with the MONTBLANC script logo and the word “automatic”.
Black Arabic numerals clearly contrast with the silvery grey background. This setting strongly contrasts with blued steel hands: leaf-shaped hour- and minute-hand, a baton-shaped second-hand with the revised Montblanc emblem as a counterweight, a slim and straight pointer for the moon’s phases and age, and a very slender date-hand with a bright red crescent at its tip.
The special polished stainless steel case offers a diameter of 42 mm and an overall height of 12.7 mm. A domed and antireflective sapphire crystal protects the dial. A pane of sapphire crystal is inserted into the screwed back to provide a clear view of mechanical self-winding Calibre MB 29.13. The movement with asymmetrical pointer date ticks at a pace of 28,800 semi-oscillations per hour (4 Hz). The date and moon-phase displays can be adjusted in single-day increments via two buttons inset into the flank of the case.
The timepiece is worn on a strap crafted from alligator leather with large reptilian scales. It is equipped with a triply folding stainless steel clasp.
The Montblanc Star Twin Moonphase will be available in Montblanc boutiques and at selected watch and jewellery stores starting in the autumn of 2014.