Launching the 110th anniversary celebrations is a new Montblanc ExoTourbillon Slim Collection, which combines the Maison’s patented ExoTourbillon complication with the addition of a quick stop-second function.
The ExoTourbillon outperforms standard tourbillon constructions for two reasons. Firstly, the weight of the cage of the ExoTourbillon is disconnected from the balance wheel, and secondly, the weight of the cage is minimal, thus resulting in higher precision and improved isochronism. The balance wheel with 9.7 mm in Diameter also plays an important part in the performance of the timepiece thanks to its impressive 18 screws—with four gold screws that can be adjusted and 14 screws that are fixed—further improving precision and traditional watchmaking aspect.
This Calibre MB 29.21 ExoTourbillon automatic movement incorporates a brand new micro-rotor decorated with a Côtes de Genève en Eventail motif and allows an uninterrupted view on the movement through a sapphire crystal case back, in comparison to a standard rotor that always hides half of the movement. The whole construction measures a mere 4.5mm in height, a feat in itself for a calibre of this complexity.
This new collection comes in a slightly larger diameter case of 42 mm, with a total height of 10.14 mm. A number of fine adjustments have been incorporated into the design of the case, such as a thinner bezel and satin finishing on the middle part of the case. Other design evolutions include modified horns that are straight on the top, yet curved underneath for improved comfort on the wrist and a more refined look.
The silvery-white dial is decorated with an exploding Montblanc Star guilloché design on the upper section, while the bottom half of the dial has been adorned with the Côtes de Genève motif to highlight the ExoTourbillon construction at 6 o’clock. This refined dial is further enhanced by elegant red gold-plated Roman numerals and red gold-plated, sword-shaped hands that have been filled with white SuperLumiNova® for maximum visibility at night. Running around the outside of the dial, a discreet minute track has been added with a red “60” at 12 o’clock for great legibility.
The Montblanc 4810 ExoTourbillon Slim is fitted with a black alligator strap to accentuate the warmth of the red gold case and red gold details on the dial. The collection has been rigorously tested by the Montblanc Laboratory Test 500, simulating real-life wear for over 500 hours.
Model: Montblanc 4810 ExoTourbillon Slim
Montblanc Manufacture Calibre MB 29.21
Mechanical movement with automatic winding, ExoTourbillon with quick stop-second mechanism
Dimensions Diameter = 30.6 mm ; height = 4.5 mm
Number of components 202
Number of rubies 29
Power reserve 50 hours
Balance Flat hoop with 18 screws
Frequency 21,600 A/h (3 Hz)
Plate Rhodium plating and stretched stripes
Bridges Rhodium plating and Côtes de Genève en Eventail
Hours and minutes from the center
Crown setting and quick stop-second indication at 3 o’clock
Patented ExoTourbillon at 6 o’clock (one revolution per minute to indicate the seconds)
18 K (5N) red gold case, satinated middle part
Crystal Scratch-resistant, domed sapphire and antireflective crystal
Case back: 18 K (5N) red gold with inset pane of sapphire crystal
Diameter = 42 mm; height = 10.14 mm
Water-tightness: 5 bar
Crown: 18 K (5N) red gold with mother-of-pearl Montblanc emblem
Silvery-white upper part of the dial with exploding star guilloché pattern and “Côte de Genève” decoration on the lower part of the dial to highlight the ExoTourbillon
Red gold-plated Roman numerals and indexes, red gold-plated luminescent hour-hand and minute-hand in dauphine shape, blued crown setting and quick stop-second indication hand
Black alligator-skin strap with 18 K (5N) red gold pin buckle
Certified by the Montblanc Performance Test 500
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