A commission for a private client, this Vacheron Constantin timepiece really is the most complicated watch in the world and includes 57 different complications, made up of 2826 individual components and 242 jewels. Ten of those complications were brand new horological inventions at the time of manufacture.

Some of the most exceptional functions? The Judaic calendar, a ‘night mode’, and a double retrograde split-seconds chronograph. The case is relatively simple and unfussy, allowing the peerless mechanics to take center stage. It seems appropriate that this watch sold for around $8 million, given that it took three watchmakers 8 years to design and create.