Richard Mille RM52-01, Blue NTPT Carbon Titanium Tourbillon Skull 50MM Watch(PRE-OWNED)DESCRIPTION The skull edition of the RM052 01 is already one of the rarest Richard Mille timepieces but this edition encased in a blue NTPT carbon case is almost impossible to find. As one of 10 pieces that were released by Richard Mille, this is a skull that is as elusive as it is treasured by the market. The RM052 01 case is tonneau shaped with a surface dimension of 50 x 42mm and 16. 15mm thick with has a titanium case band and an NTPT blue carbon