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SIHH 2013: IWC - Ingenieur Constant-Force Tourbillon Ref. 5900

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The Ingenieur Constant-Force TourbillonIWC's top model presented at SIHH 2013, features an impressive patented constant-force mechanism integrated in a tourbillon to ensure an extremely precise rate.
The tourbillon - positioned at 9 o'clock - revolves around its own axis once every 60 seconds to offset the influence of gravity on any positional error in the balance and its adverse effect on the rate. Down in the depths of the tourbillon we see the constant-force mechanism, the true heart of the watch. This intricate assembly allows the escapement to be uncoupled from the gear train, which keeps the amplitude of the balance – and thus the watch’s rate – virtually constant.

The constant-force tourbillon guarantees a regular and precise rate over a period of at least 48 hours.

The 46 mm wide and 14 mm high case - characterized by the five bores in the bezel typical of the Ingenieur line - is in platinum with black ceramic lugs. 

The quality of the finishing of the dial is well represented by the double moon display: as you can see in the picture below, the surface of the earth’s satellite is rendered - using a special 3D-laser technique - with impressive details. The countdown display on the outer ring of the totalizer shows the number of days remaining before the next full moon. 
The retrograde power reserve display, positioned between 4 and 5 o’clock, has a triangular indicator to show the power remaining that never hides the IWC logo.

The in-house calibre 94800, visible through a transparent sapphire-glass back, is inspired by the engine block of a sports car. Perforated sections reveal the  intermeshing gears while engravings provide technical details. The two barrels provide the energy for the higher torque required to drive the constant-force tourbillon and for the moon phase module.

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