HD3 Complication watch designer Fabrice Gonet created this revolutionary bi-axial tourbillon as a concept and was so popular that they decided to sell it.

It comes in a square-shaped case, made of titanium and platinum, and is water resistant to 50 meters with an 80-hour power reserve. Even at $400,000, all 11 limited edition watches were sold out quickly.

The coolest feature is the bi-axial tourbillon which rotates in 1-minute increments on the 1st axis and 30 seconds on the 2nd axis. Watch the video (below) to see the tourbillon in action.