The IWC Big Pilot Constant-Force Tourbillon IWC Racing reference IW5905-01 is a limited edition of 15 pieces introduced in 2020. This Big Pilot has a matte black case in 'Ceratanium', and a blacked-out version of the caliber 94800 movement.
IWC manufactured 94800 calibre (94000-calibre family) is a hand-wound movement with a tourbillon escapement. A patented constant force mechanism is integrated into the tourbillon, ensuring a stable amplitude of the balance - visible through 1 second jumps of the tourbillon. After having run for 48 hours, the constant force mechanism is decoupled and the tourbillon will move in regular 1/5th of a second intervals. It furthermore features a day/night indication, double moonphase display and a 96 hour power reserve.