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One of the first shots fired was by IWC. The company's head link movement constructor, Kurt Klaus, developed a high-precision moonphase display while working on the perpetual calendar/chronograph movement for the Da Vinci, in the 1980s. He calculated a gear train that would be off by a day every 122 years. Current perpetuals from IWC link are accurate to link one day every 577.5 years.
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