which you captured very well. It is quite a complication, almost a 'Grand Complication'. Elegantly packed by Blancpain in a watch that does so well without a display back.
The movement is, btw, a split-second flyback chronograph with a perpetual calender added on top (that means it is not entirely integrated). That said, I am not aware of any production watch which would have the perpetual function integrated into the main plate.
Enjoy many lucky hours with your new treasure!
Best,
Magnus