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Glashütte Original

The Senator and Panoretrograph

 

are Perpetual Calendars and Chronographs respectively.

THe perpetual Calendar basically keeps track of the month, day, date and leap year in addition to time of course.  THe panoretrograph has a choronograph for timing.  How the Panoretro does it however is rather different from most chronos.  It also has a unique countdown function not present in any other chrono I know of.

Not sure if thsi is what you are asking.

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