IWC

Both models of the IWC Novecento PC have screwed down crowns that set to one of three positions once unscrewed: first position for winding the mainspring; second position for advancing the calendar, with one anti-clockwise revolution yielding a one-day advance of the calendar; and the third position for setting the hour and minute hands. One can use position 3 and turn the hour and minute hands through 2 sequential 12-hr cycles to advance the time and calendar models through a day, but it takes much more effort and time than using position 2 and advancing the calendar module one day at a time.

Because the calendar and moon phase are programmed into the internal mechanism in the calendar module until leap day in the year 2100, there is no need for individual pushers to adjust the day, date, month, and moon phase, nor for making potentially confusing sequences of adjustments that must be followed to get all of the wheels aligned such that each one drives the correct next one which is based on how the module or movement was designed.  I have 3 other watches, from 3 different major Swiss brands, with pusher-set calendars, and all differ significantly in which display component must be set in what order to successfully set the calendar and have it advance with the time module.  Some even warn quite severely that the movement/module could be damaged if the instructions are not followed explicitly.  The major caution with the IWC module is not to advance it beyond the current date and time because it cannot be set backwards; should one get ahead of the actual date/time while setting it, it is simply a matter of setting the watch aside for a period until actual time passes that which the watch has stopped at and then setting it again (more carefully!!).  And yes, I have done that!!

I hope this response addresses your question adequately.  Best, Mike

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