My selection

Metal
Complications
Breguet Invention
Rewinding
Power reserve (hour)
Calibre
Gemstones
Frequency (Hz)
Balance-wheel
Escapement
Spirale
Oscillating weight
Number of components
Skeleton
Shape
Height of the box (mm)
Width of the box (mm)
Thickness of the box (mm)
Sapphire caseback
Water resistance (m)