First of all, everything the brand did fit in a similar case size as the normal perpetual calendar, just slightly wider and thicker. Only slightly. At 44.4mm and 15mm thick in a platinum case, there's some heft on the wrist. And yet, it's far more wearable than the Franck Mueller (or Patek, for that matter, which is a workout with two hands). But inside is where it counts. For all the celebration of the accuracy, how IWC did it is almost as interesting as the result.
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