Richard Mille - RM 004 - Split-Seconds Chronograph (V2 and V3)Reference: RM 004 Model: Split Seconds Chronograph (V2 and V3) The RM 004 and RM 008 are both split seconds wristwatches with virtually the same mechanical layout and design. The only significant technical difference between them is that the RM 008 is driven by a tourbillon escapement. The implementation of a carbon nanofibre baseplate in the development of the RM 003 required an almost total revision of its structural design and assembly methods,