The perpetual calendar is equipped with four retrograde hands. One for the months, one for the leap years, as well as two large ones that share the task of sweeping over the broad date scale. The left one covers the first half of the month, and the right-hand one the second half.
Running equation of time, Master Gyrotourbillon 1
Aventurine dial, Master Gyrotourbillon 1
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Retrograde perpetual calendar, Master Gyrotourbillon 1
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