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The split-seconds, or rattrapante chronograph, was traditionally considered one of the most challenging complications to create, thanks not only to its complexity, but also to the degree of skill necessary to assemble and adjust the classic split-seconds mechanism. The term "grand complication" traditionally referred to a watch than combined the rattrapante with two other extremely challenging complications: the perpetual calendar and the minute repeater. In 1993, however, IWC presented its Doppelchronograph, with a modern version of the split-seconds complication, designed by Richard Habring, which replaced the delicate, traditional column-wheel-controlled mechanism with a far more robust cam-controlled mechanism, built into the Valjoux/ETA 7750. It was a runaway success for IWC, and when the patent expired in 2012, Habring was able to introduce his own, updated version of his complication: the Habring² Doppel 2.0. The latest Habring² version of this cam-operated split-seconds complication was introduced earlier this year: the Habring² Doppel-Felix.
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