which is they instant operation: the disks switch within a fraction of a second. The mechanism is a bit power hungry, thus the power reserve is rated less than the standard movement (note: 'rated' in italics since it might run much longer than the indicated power reserve, its just not guaranteed). Here we have a very special example, the Tourbillon Big Date Transparence (Ref. 2825-3600-53B) which is rated for 7 days instead of 8:






While we are with special version - here is one for the girls (Ref. 2825-4963-55B, with a patended gem setting technique):
The stone are set in rails with balls, thus giving the impression of floating without cramps between them - very elegant:








Eye candies for the weekend!
Cheers,
Magnus