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Cartier Rotonde de Cartier Perpetual Calendar Chronograph

Tap between 10 and 11 to start/stop the stopwatch
Tap between 1 and 2 to reset
Seconds hand is for stopwatch seconds
4th hand represents day of the month
Day of the week at the bottom subdial
Month and Leap year at the top subdial

Tap center to switch to black dial

Thanks for watching!

In action here by +Bramante Perkasa​​​​:

Sorry for the lowres image. I don't know why my phone is suddenly uploading them that way :(
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