IWC Ingenieur Constant-Force Tourbillon Reference 5900 Watch Operating Instructions

Your IWC watch shows you the time in hours, minutes and seconds, together with the moon phases in both hemispheres, the time left until the next full moon and the power in reserve. The mechanical movement with automatic winding has a power reserve of approximately 96 hours when fully wound. Your Ingenieur Constant-Force Tourbillon is protected by a sapphire glass of hardness grade 9 on Mohs’ scale. Your watch is water-resistant 12 bar. Furthermore, it is equipped with a minute tourbillon, a unique micro mech anism, which minimizes the effect of gravity on the rate precision. The constant­force mechanism, which is housed directly in the tourbillon, ensures consistent amplitude over at least 2 days. This is indicated by the one-second jumps of the seconds hand in the tourbillon. If the energy in the two barrels is insufficient to maintain the constant ­ force mechanism, the watch rate automatically switches to 2.5 Hertz. This can be seen in the fact that the seconds hand on the tourbillon is now moving constantly. This rate corresponds to that of a standard tourbillon.To ensure that this extraordinary watch continues to perform faultlessly in the future, it is essential to observe a few important operating instructions.

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In IWC Ingenieur Constant-Force Tourbillon Watch Manual


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