Ancienne Le Brassus
1583
a 2nd hairspring
The video made it very clear. If I understand correctly, the 'blade', or more precisely 'wire' running across horizontally acts as a second hairspring, like the new AP Chronometer, where
it gives a counter impulse to to that of the balance wheel/hairspring assembly.
Very nice watch!!! And probably works better than a tourbillon as it doesn't matter in what position the 'wire/blade' is in, the torque is the same, I assume.
Thanks for the great post!