The Romain Jerome caliber RJ2000-A was a mechanical collaborative design by RJ CEO Manuel Emch and watchmaker Jean-Marc Wiederrecht.
From the press-release:
Designed to minimize resistance to motion, the case houses an ingenious mechanical movement created for RJ-Romain Jerome by Agenhor. The Subcraft hides its true heart under its smooth, flawless case, revealing Manuel Emch and Jean-Marc Wiederrecht’s mechanical collaboration with the creation of a unique movement that brings this new timepiece to life. This highly sophisticated movement combines four different complications – lateral, linear, jumping and retrograde – and represents one of the most complicated indications of time ever made to date.