in the "V" of "VII" to be specific. Two examples include the Astrotourbillon and Tortue perpetual calendar.


But a change in position to "X" is sometimes necessary due to the dial design or complication.
So for instance in the Calibre de Cartier it is at "X" because there is no "VII".

While in the Santos Triple 100 it is deemed to look better in "X" than "VII".

While in the Tank made for the handover of Hong Kong there is a "7" so it is at "X".

- SJX