Montblanc MB M13.21 Manual Del Usuario página 21

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Calibre MB M16.62 Calibre MB M16.62
Exo Tourbillon Chronographe Rattrapante
Available in the Heritage Chronométrie Collection
The manufacture calibre MB M16.62 Exo Tourbillon Rattrapante is a manual movement that combines all
the elements of the upmarket watchmaker's art.
The mechanism, of an absolute accuracy, contains a tourbillon of patented design.
This calibre has a large balance-wheel oscillating at 18,000 vibrations per hour (2.5 Hz), located outside
the tourbillon cage. This innovative mechanism is called "Exo Tourbillon", from the Greek prefix "exo",
meaning "external" or "exterior".
The advantage of this construction is that it allows the use of a smaller, and therefore lighter, cage, needing
less energy to drive its rotating motion. The rotating cage is also relieved of the weight of the screwed
balance: this technical feat further reduces the energy required since the balance, isolated from the rotating
cage, is not disturbed by the cage's inertia.
The calibre MB M16.62 Exo Tourbillon Rattrapante is equipped with a chronograph mechanism combined
with a flyback system that allows time intervals to be measured from 1 second to 30 minutes for multiple
events sharing the same starting point (intermediate times) but a different ending point. It is a flyback
monopusher chronograph calibre, meaning the chronograph's launch, stop and reset functions are activated
in sequence by pressing the push-piece, while the flyback function is controlled by a separate dedicated push-
piece. This horological complication cannot function without the chronograph's activation.
The power reserve of the calibre MB M16.62 is about 50 hours.