Simplex Selematic 5 rear derailleur: opening up cleaning overhaul

Simplex Selematic 5 rear derailleur. Crazy design and weighing in at 525g. From What I’ve read, it was realised in 1981 and ceased possibly by the mid 80’s. This is the 6 speed later model. Patented by it’s inventer Pierre Bonnard. Licensed under ANVAR, made by Simplex.