The C3H5N309 is very nifty and peculiar little machine. The movement features obligatory Reuleaux polygon rotors, inspired by the epitrochoid combustion chamber of a Wankel engine. It would be rude to expect anything less from a collaboration of Urwerk and MB&F. I have done an earlier post on the HM5, a watch which also testifies to the adeptness of MB&F.
This particular limited edition of the C3H5N309 is distinguished by its black case (made from zirconium) and black movement. This wristwatch retails for $182,000.