Not totally certain
but I suspect this cleaner was manufactured for the independent retail supply chain. The black rigid hose and looped handle came after the "new" range of Sensotronic cleaners were put into production around 1984 (first models had a stretch hose), these being the models with two larger separate foot pedals. Thus, despite the older design of console and single, long foot-pedal, I would say this is post 1985. What a find it is!