An upgrade to the BBC Master series which I couldn't really see the point in at the time of release - I think it cost about the same as a regular BBC Master but had the incompatible 3.5'' ADFS floppy drive. This disc type and the keyboard being separate from the base unit, plus the early stab at a desktop system on the Welcome disc, speaks to me of an early indication of the way things would go with the Archimedes A300 and 400 series.
This pretty sweet setup - complete with monitor - I got off the newsgroups for a reasonable price, although I can't remember what. My usual price is about £30, so this case can't be far off. I had thought that it wasn't going to turn up, but it was just the previous owner trying to find me a backup of the welcome disk which was well worth having.