Hooverette
You have done a great job there Anthony, it looks like it has just come from the factory.
I was never quite sure why Hoover brought this out as there does not seem like there would have been a market then for a cleaner to bring out for a "quick run round" and there was the Dustette (with tools) for those who did not care for the bother of using tools on the Junior or were not impressed with the woeful suction of the 652 and onwards Seniors. And for those who wanted a cheap "first" cleaner there were plenty of more conventional cleaners around at a similar or cheaper price - Bylocks, the very many varieties of Siroma cleaner, cheaper Goblin models and later models from the Eastern Bloc. Yet it was in the product line-up (largely unchanged apart from colour) for nearly 20 years so it must have been selling somewhere.
I suspect that many may have been bought as wedding presents (low price but with a good name) only to be consigned to the loft or the back of a cupboard fairly quickly. That may account for how many show up on ebay - this is by no means a rare model.
As I mentioned above it might be worth keeping your eye open for a power nozzle at low cost(the hoses for both Sensotronic series to use them are notoriously fragile and replacement virtually impossible) or perhaps it might be possible to use one from another brand (Vorwerk springs to mind) and fabricate a connection with some spare Hoover wand. Having seen your deconstruction of your cleaner it looks to be a simple job to attach a power outlet for a PN, this will improve the performance considerably.
By the way, the clip on felt pad was for use with parquet floors.
Al