A dial that had to hold the movement together.
Most skull watches print or apply a skull onto a dial. The RM 52-01 machines one out of a single block of metal and then uses it as the dial plate: the cheekbones and brow carry the hour markers, and the jaw holds the tourbillon cage at six o'clock. It is a structural component, which is why it took the work it did.
Richard Mille released it across several case materials over the years — titanium, Carbon TPT, and sapphire among them — and the skull itself has been executed in different finishes. The case version changes the character of the watch considerably, so it is worth being specific about which one you mean.
Under it is a manual-winding tourbillon on a skeletonised baseplate. These were made in small runs and are held rather than traded, so this is a network search and often a patient one.
- Skull machined from a single block and used as the structural dial
- Tourbillon carried in the jaw at six o'clock
- Released across several case materials and skull finishes
- Small limited runs; held rather than traded